From 95ebaf15aaee139b329a1420b72c2db5b6c1d462 Mon Sep 17 00:00:00 2001
From: Luke Page <luke.a.page@gmail.com>
Date: Fri, 3 May 2019 12:47:54 +0200
Subject: [PATCH] feat: Modern html report (#345)

---
 .eslintignore                                 |    1 +
 .eslintrc                                     |   26 +-
 package-lock.json                             |  131 +-
 package.json                                  |    5 +
 packages/istanbul-reports/.gitignore          |    1 +
 .../istanbul-reports/lib/html-spa/.babelrc    |    3 +
 .../lib/html-spa/assets/sort-arrow-sprite.png |  Bin 0 -> 209 bytes
 .../lib/html-spa/assets/spa.css               |  256 ++
 .../istanbul-reports/lib/html-spa/index.js    |  176 +
 .../lib/html-spa/rollup.config.js             |   42 +
 .../lib/html-spa/src/filterButtons.js         |   48 +
 .../lib/html-spa/src/flattenButton.js         |   14 +
 .../lib/html-spa/src/getChildData.js          |  152 +
 .../lib/html-spa/src/index.js                 |  153 +
 .../lib/html-spa/src/routing.js               |   52 +
 .../lib/html-spa/src/summaryHeader.js         |   67 +
 .../lib/html-spa/src/summaryTableHeader.js    |  123 +
 .../lib/html-spa/src/summaryTableLine.js      |  188 +
 packages/istanbul-reports/package-lock.json   | 2602 ++++++++++++-
 packages/istanbul-reports/package.json        |   16 +-
 .../fixtures/specs/100-line-100-branch.json   | 3035 +++++++--------
 .../specs/100-line-missing-branch.json        | 3189 ++++++++--------
 .../fixtures/specs/empty-file-skip-empty.json |  102 +-
 .../test/fixtures/specs/empty-file.json       |   96 +-
 .../specs/missing-line-missing-branch.json    | 3261 +++++++++--------
 .../istanbul-reports/test/html-spa/index.js   |  179 +
 26 files changed, 9124 insertions(+), 4794 deletions(-)
 create mode 100644 packages/istanbul-reports/.gitignore
 create mode 100644 packages/istanbul-reports/lib/html-spa/.babelrc
 create mode 100644 packages/istanbul-reports/lib/html-spa/assets/sort-arrow-sprite.png
 create mode 100644 packages/istanbul-reports/lib/html-spa/assets/spa.css
 create mode 100644 packages/istanbul-reports/lib/html-spa/index.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/rollup.config.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/filterButtons.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/flattenButton.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/getChildData.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/index.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/routing.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/summaryHeader.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/summaryTableHeader.js
 create mode 100644 packages/istanbul-reports/lib/html-spa/src/summaryTableLine.js
 create mode 100644 packages/istanbul-reports/test/html-spa/index.js

diff --git a/.eslintignore b/.eslintignore
index c5a8f425..df3e9ca9 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,5 +1,6 @@
 node_modules/
 vendor/
 packages/istanbul-api/test/sample-code/bad.js
+packages/istanbul-reports/lib/html-spa/assets/bundle.js
 coverage
 dist
diff --git a/.eslintrc b/.eslintrc
index 1c82efb2..cc9b68c0 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -3,8 +3,14 @@
         "eslint:recommended",
         "plugin:prettier/recommended",
         "plugin:import/errors",
-        "plugin:import/warnings"
+        "plugin:import/warnings",
+        "plugin:react/recommended"
     ],
+    "settings": {
+        "react": {
+            "version": "16.8"
+        }
+    },
     "parserOptions": {
         "ecmaVersion": 7,
         "sourceType": "module"
@@ -24,6 +30,24 @@
                 "browser": true
             }
         },
+        {
+            "files": "packages/istanbul-reports/lib/html-spa/src/**",
+            "parser": "babel-eslint",
+            "parserOptions": {
+                "ecmaVersion": 2019,
+                "sourceType": "module",
+                "ecmaFeatures": {
+                    "jsx": true
+                }
+            },
+            "env": {
+                "browser": true
+            },
+            "rules": {
+                "react/prop-types": "off",
+                "react/jsx-no-target-blank": "off"
+            }
+        },
         {
             "files": "!packages/istanbul-reports/lib/html/assets/**",
             "rules": {
diff --git a/package-lock.json b/package-lock.json
index 24485e6e..de6faba7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2494,6 +2494,32 @@
       "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
       "dev": true
     },
+    "babel-eslint": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.0.1.tgz",
+      "integrity": "sha512-z7OT1iNV+TjOwHNLLyJk+HN+YVWX+CLE6fPD2SymJZOZQBs+QIexFjhm4keGTm8MW9xr4EC9Q0PbaLB24V5GoQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.0.0",
+        "@babel/traverse": "^7.0.0",
+        "@babel/types": "^7.0.0",
+        "eslint-scope": "3.7.1",
+        "eslint-visitor-keys": "^1.0.0"
+      },
+      "dependencies": {
+        "eslint-scope": {
+          "version": "3.7.1",
+          "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-3.7.1.tgz",
+          "integrity": "sha1-PWPD7f2gLgbgGkUq2IyqzHzctug=",
+          "dev": true,
+          "requires": {
+            "esrecurse": "^4.1.0",
+            "estraverse": "^4.1.1"
+          }
+        }
+      }
+    },
     "babelify": {
       "version": "10.0.0",
       "resolved": "https://registry.npmjs.org/babelify/-/babelify-10.0.0.tgz",
@@ -4442,6 +4468,32 @@
         "prettier-linter-helpers": "^1.0.0"
       }
     },
+    "eslint-plugin-react": {
+      "version": "7.12.4",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-react/-/eslint-plugin-react-7.12.4.tgz",
+      "integrity": "sha512-1puHJkXJY+oS1t467MjbqjvX53uQ05HXwjqDgdbGBqf5j9eeydI54G3KwiJmWciQ0HTBacIKw2jgwSBSH3yfgQ==",
+      "dev": true,
+      "requires": {
+        "array-includes": "^3.0.3",
+        "doctrine": "^2.1.0",
+        "has": "^1.0.3",
+        "jsx-ast-utils": "^2.0.1",
+        "object.fromentries": "^2.0.0",
+        "prop-types": "^15.6.2",
+        "resolve": "^1.9.0"
+      },
+      "dependencies": {
+        "doctrine": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-2.1.0.tgz",
+          "integrity": "sha512-35mSku4ZXK0vfCuHEDAwt55dg2jNajHZ1odvF+8SSr82EsZY4QmXfuWso8oEd8zRhVObSN18aM0CjSdoBX7zIw==",
+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2"
+          }
+        }
+      }
+    },
     "eslint-scope": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/eslint-scope/-/eslint-scope-4.0.3.tgz",
@@ -4999,8 +5051,7 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -5021,14 +5072,12 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -5043,20 +5092,17 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -5173,8 +5219,7 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "ini": {
           "version": "1.3.5",
@@ -5186,7 +5231,6 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -5201,7 +5245,6 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -5209,14 +5252,12 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -5235,7 +5276,6 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -5316,8 +5356,7 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -5329,7 +5368,6 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5415,8 +5453,7 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -5452,7 +5489,6 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -5472,7 +5508,6 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -5516,14 +5551,12 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         }
       }
     },
@@ -7087,6 +7120,15 @@
         "verror": "1.10.0"
       }
     },
+    "jsx-ast-utils": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/jsx-ast-utils/-/jsx-ast-utils-2.0.1.tgz",
+      "integrity": "sha1-6AGxs5mF4g//yHtA43SAgOLcrH8=",
+      "dev": true,
+      "requires": {
+        "array-includes": "^3.0.3"
+      }
+    },
     "kind-of": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-6.0.2.tgz",
@@ -8605,6 +8647,18 @@
         "object-keys": "^1.0.11"
       }
     },
+    "object.fromentries": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/object.fromentries/-/object.fromentries-2.0.0.tgz",
+      "integrity": "sha512-9iLiI6H083uiqUuvzyY6qrlmc/Gz8hLQFOcb/Ri/0xXFkSNS3ctV+CbE6yM2+AnkYfOB3dGjdzC0wrMLIhQICA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.11.0",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.1"
+      }
+    },
     "object.getownpropertydescriptors": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz",
@@ -9192,6 +9246,17 @@
         "read": "1"
       }
     },
+    "prop-types": {
+      "version": "15.7.2",
+      "resolved": "https://registry.npmjs.org/prop-types/-/prop-types-15.7.2.tgz",
+      "integrity": "sha512-8QQikdH7//R2vurIJSutZ1smHYTcLpRWEOlHnzcWHmBYrOGUysKwSsrC89BCiFj3CbrfJ/nXFdJepOVrY1GCHQ==",
+      "dev": true,
+      "requires": {
+        "loose-envify": "^1.4.0",
+        "object-assign": "^4.1.1",
+        "react-is": "^16.8.1"
+      }
+    },
     "property-information": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/property-information/-/property-information-4.2.0.tgz",
@@ -9307,6 +9372,12 @@
         }
       }
     },
+    "react-is": {
+      "version": "16.8.6",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.8.6.tgz",
+      "integrity": "sha512-aUk3bHfZ2bRSVFFbbeVS4i+lNPZr3/WM5jT2J5omUVV1zzcs1nAaf3l51ctA5FFvCRbhrH0bdAsRRQddFJZPtA==",
+      "dev": true
+    },
     "read": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/read/-/read-1.0.7.tgz",
diff --git a/package.json b/package.json
index 9e39fbfc..bbb04447 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,7 @@
     "@babel/core": "^7.4.3",
     "@babel/preset-env": "^7.4.3",
     "@babel/register": "^7.4.0",
+    "babel-eslint": "^10.0.1",
     "chai": "^4.2.0",
     "clone": "^2.1.2",
     "coveralls": "^3.0.3",
@@ -39,6 +40,7 @@
     "eslint-config-prettier": "^4.1.0",
     "eslint-plugin-import": "^2.17.2",
     "eslint-plugin-prettier": "^3.0.1",
+    "eslint-plugin-react": "^7.12.4",
     "is-windows": "^1.0.2",
     "js-yaml": "^3.13.1",
     "lerna": "^3.13.3",
@@ -56,6 +58,9 @@
       "**/coverage/**",
       "**/dist/**",
       "**/html/assets/**",
+      "**/html-spa/assets/**",
+      "**/html-spa/src/**",
+      "**/html-spa/rollup.config.js",
       "**/test/**"
     ],
     "reporter": [
diff --git a/packages/istanbul-reports/.gitignore b/packages/istanbul-reports/.gitignore
new file mode 100644
index 00000000..135ae49e
--- /dev/null
+++ b/packages/istanbul-reports/.gitignore
@@ -0,0 +1 @@
+lib/html-spa/assets/bundle.js
\ No newline at end of file
diff --git a/packages/istanbul-reports/lib/html-spa/.babelrc b/packages/istanbul-reports/lib/html-spa/.babelrc
new file mode 100644
index 00000000..86ef2108
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/.babelrc
@@ -0,0 +1,3 @@
+{
+    "presets": ["@babel/preset-env", "@babel/preset-react"]
+}
diff --git a/packages/istanbul-reports/lib/html-spa/assets/sort-arrow-sprite.png b/packages/istanbul-reports/lib/html-spa/assets/sort-arrow-sprite.png
new file mode 100644
index 0000000000000000000000000000000000000000..03f704a609c6fd0dbfdac63466a7d7c958b5cbf3
GIT binary patch
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diff --git a/packages/istanbul-reports/lib/html-spa/assets/spa.css b/packages/istanbul-reports/lib/html-spa/assets/spa.css
new file mode 100644
index 00000000..519464c9
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/assets/spa.css
@@ -0,0 +1,256 @@
+body,
+html {
+    margin: 0;
+    padding: 0;
+    height: 100%;
+}
+body {
+    font-family: Helvetica Neue, Helvetica, Arial;
+    font-size: 14px;
+    color: #333;
+}
+.small {
+    font-size: 12px;
+}
+*,
+*:after,
+*:before {
+    -webkit-box-sizing: border-box;
+    -moz-box-sizing: border-box;
+    box-sizing: border-box;
+}
+h1 {
+    font-size: 20px;
+    margin: 0;
+}
+a {
+    color: #0074d9;
+    text-decoration: none;
+}
+a:hover {
+    text-decoration: underline;
+}
+.strong {
+    font-weight: bold;
+}
+.space-top1 {
+    padding: 10px 0 0 0;
+}
+.pad1y {
+    padding: 10px 0;
+}
+.pad2 {
+    padding: 20px;
+}
+.pad1 {
+    padding: 10px;
+}
+.space-right2 {
+    padding-right: 20px;
+}
+.center {
+    text-align: center;
+}
+.clearfix {
+    display: block;
+}
+.clearfix:after {
+    content: '';
+    display: block;
+    height: 0;
+    clear: both;
+    visibility: hidden;
+}
+.fl {
+    float: left;
+}
+@media only screen and (max-width: 640px) {
+    .col3 {
+        width: 100%;
+        max-width: 100%;
+    }
+    .hide-mobile {
+        display: none !important;
+    }
+}
+
+.quiet {
+    color: #7f7f7f;
+    color: rgba(0, 0, 0, 0.5);
+}
+.quiet a {
+    opacity: 0.7;
+}
+
+.fraction {
+    font-family: Consolas, 'Liberation Mono', Menlo, Courier, monospace;
+    font-size: 10px;
+    color: #555;
+    background: #e8e8e8;
+    padding: 4px 5px;
+    border-radius: 3px;
+    vertical-align: middle;
+}
+
+.coverage-summary {
+    border-collapse: collapse;
+    border: 1px solid #bbb;
+    width: 100%;
+}
+.coverage-summary tr {
+    border-bottom: 1px solid #bbb;
+}
+.coverage-summary td,
+.coverage-summary th {
+    padding: 5px 7px;
+}
+.coverage-summary td,
+.coverage-summary th {
+    border-right: 1px solid #bbb;
+}
+.coverage-summary td:last-child,
+.coverage-summary th:last-child {
+    border-right: none;
+}
+.coverage-summary th {
+    text-align: left;
+    font-weight: normal;
+    white-space: nowrap;
+}
+.coverage-summary th.pic,
+.coverage-summary th.abs,
+.coverage-summary td.pct,
+.coverage-summary td.abs {
+    text-align: right;
+}
+.coverage-summary td.file {
+    white-space: nowrap;
+}
+.coverage-summary td.pic {
+    min-width: 120px !important;
+}
+.coverage-summary .sorter {
+    height: 10px;
+    width: 7px;
+    display: inline-block;
+    margin-left: 0.5em;
+    background: url(sort-arrow-sprite.png) no-repeat scroll 0 0 transparent;
+}
+.coverage-summary .sorted .sorter {
+    background-position: 0 -20px;
+}
+.coverage-summary .sorted-desc .sorter {
+    background-position: 0 -10px;
+}
+/* dark red */
+.red.solid,
+.low .cover-fill {
+    background: #c21f39;
+}
+/* light red */
+.low {
+    background: #fce1e5;
+}
+/* light green */
+.high {
+    background: rgb(230, 245, 208);
+}
+/* dark green */
+.high .cover-fill {
+    background: rgb(77, 146, 33);
+}
+/* dark yellow (gold) */
+.medium .cover-fill {
+    background: #f9cd0b;
+}
+/* light yellow */
+.medium {
+    background: #fff4c2;
+}
+
+.coverage-summary td.empty {
+    opacity: 0.5;
+    padding-top: 4px;
+    padding-bottom: 4px;
+    line-height: 1;
+    color: #888;
+}
+
+.cover-fill,
+.cover-empty {
+    display: inline-block;
+    height: 4px;
+}
+.chart {
+    line-height: 0;
+}
+.cover-empty {
+    background: white;
+}
+.cover-full {
+    border-right: none !important;
+}
+
+.app {
+    min-height: 100%;
+    display: flex;
+    flex-direction: column;
+}
+.body {
+    flex-grow: 1;
+}
+.footer {
+    height: 48px;
+    flex-shrink: 0;
+}
+.togglebutton.enabled {
+    border-style: inset;
+}
+.expandbutton {
+    color: black;
+    font-weight: bold;
+    font-size: 1.2em;
+    margin-right: 0.1em;
+    padding: 0.1em;
+    width: 0.8em;
+    display: inline-block;
+    background-color: transparent;
+    border: none;
+}
+.filetab {
+    display: inline-block;
+    width: 1.1em;
+}
+.coverage-summary .topheading {
+    border-bottom: none;
+}
+.coverage-summary .headercell {
+    border-top: 1px solid #eee;
+    text-align: right;
+    font-size: 11px;
+}
+.coverage-summary .headercell:nth-child(3n),
+.coverage-summary .headercell:nth-child(3n + 1),
+.coverage-summary td:nth-child(3n + 2),
+.coverage-summary td:nth-child(3n + 3) {
+    border-right: 1px solid #ddd;
+}
+.coverage-summary tbody tr:nth-child(2n) td {
+    padding: 0;
+}
+.coverage-summary tbody tr:nth-child(2n - 1) {
+    border-bottom: none;
+}
+.coverage-summary td.file {
+    border-bottom: 1px solid #bbb;
+}
+.buttongroup {
+    display: inline-block;
+    margin-right: 40px;
+}
+.buttongroup label {
+    margin-right: 15px;
+}
+th.sortable {
+    cursor: pointer;
+}
diff --git a/packages/istanbul-reports/lib/html-spa/index.js b/packages/istanbul-reports/lib/html-spa/index.js
new file mode 100644
index 00000000..2f723d2f
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/index.js
@@ -0,0 +1,176 @@
+/*
+ Copyright 2012-2015, Yahoo Inc.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+const fs = require('fs');
+const path = require('path');
+const HtmlReport = require('../html');
+
+const standardLinkMapper = {
+    getPath(node) {
+        if (typeof node === 'string') {
+            return node;
+        }
+        let filePath = node.getQualifiedName();
+        if (node.isSummary()) {
+            if (filePath !== '') {
+                filePath += '/index.html';
+            } else {
+                filePath = 'index.html';
+            }
+        } else {
+            filePath += '.html';
+        }
+        return filePath;
+    },
+
+    relativePath(source, target) {
+        const targetPath = this.getPath(target);
+        const sourcePath = path.dirname(this.getPath(source));
+        return path.relative(sourcePath, targetPath);
+    },
+
+    assetPath(node, name) {
+        return this.relativePath(this.getPath(node), name);
+    }
+};
+
+class HtmlSpaReport {
+    constructor(opts = {}) {
+        this.verbose = opts.verbose || false;
+        this.linkMapper = opts.linkMapper || standardLinkMapper;
+        this.subdir = opts.subdir || '';
+        this.date = Date();
+        this.skipEmpty = opts.skipEmpty;
+        this.htmlReport = new HtmlReport(opts);
+        this.htmlReport.getBreadcrumbHtml = function() {
+            return '<a href="javascript:history.back()">Back</a>';
+        };
+
+        this.metricsToShow = opts.metricsToShow || [
+            'lines',
+            'branches',
+            'functions'
+        ];
+    }
+
+    getWriter(context) {
+        if (!this.subdir) {
+            return context.writer;
+        }
+        return context.writer.writerForDir(this.subdir);
+    }
+
+    onStart(root, context) {
+        this.htmlReport.onStart(root, context);
+
+        const writer = this.getWriter(context);
+        const srcDir = path.resolve(__dirname, './assets');
+        fs.readdirSync(srcDir).forEach(f => {
+            const resolvedSource = path.resolve(srcDir, f);
+            const resolvedDestination = '.';
+            const stat = fs.statSync(resolvedSource);
+            let dest;
+
+            if (stat.isFile()) {
+                dest = resolvedDestination + '/' + f;
+                if (this.verbose) {
+                    console.log('Write asset: ' + dest);
+                }
+                writer.copyFile(resolvedSource, dest);
+            }
+        });
+    }
+
+    onDetail(node, context) {
+        this.htmlReport.onDetail(node, context);
+    }
+
+    getMetric(metric, type, isEmpty, context) {
+        return {
+            total: metric.total,
+            covered: metric.covered,
+            skipped: metric.skipped,
+            pct: isEmpty ? 0 : metric.pct,
+            classForPercent: isEmpty
+                ? 'empty'
+                : context.classForPercent(type, metric.pct)
+        };
+    }
+
+    toDataStructure(node, context) {
+        const coverageSummary = node.getCoverageSummary();
+        const isEmpty = coverageSummary.isEmpty();
+        const metrics = {
+            statements: this.getMetric(
+                coverageSummary.statements,
+                'statements',
+                isEmpty,
+                context
+            ),
+            branches: this.getMetric(
+                coverageSummary.branches,
+                'branches',
+                isEmpty,
+                context
+            ),
+            functions: this.getMetric(
+                coverageSummary.functions,
+                'functions',
+                isEmpty,
+                context
+            ),
+            lines: this.getMetric(
+                coverageSummary.lines,
+                'lines',
+                isEmpty,
+                context
+            )
+        };
+
+        return {
+            file: node.getRelativeName(),
+            isEmpty,
+            metrics,
+            children:
+                node.isSummary() &&
+                node
+                    .getChildren()
+                    .map(child => this.toDataStructure(child, context))
+        };
+    }
+
+    onEnd(rootNode, context) {
+        const data = this.toDataStructure(rootNode, context);
+
+        const cw = this.getWriter(context).writeFile(
+            this.linkMapper.getPath(rootNode)
+        );
+
+        cw.write(
+            `<!doctype html>
+            <html lang="en">
+                <head>
+                    <link rel="stylesheet" href="spa.css" />
+                    <meta name="viewport" content="width=device-width, initial-scale=1">
+                </head>
+                <body>
+                    <div id="app" class="app"></div>
+                    <script>
+                        window.data = ${JSON.stringify(data)};
+                        window.generatedDatetime = ${JSON.stringify(
+                            String(Date())
+                        )};
+                        window.metricsToShow = ${JSON.stringify(
+                            this.metricsToShow
+                        )};
+                    </script>
+                    <script src="bundle.js"></script>
+                </body>
+            </html>`
+        );
+        cw.close();
+    }
+}
+
+module.exports = HtmlSpaReport;
diff --git a/packages/istanbul-reports/lib/html-spa/rollup.config.js b/packages/istanbul-reports/lib/html-spa/rollup.config.js
new file mode 100644
index 00000000..4786b6e6
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/rollup.config.js
@@ -0,0 +1,42 @@
+import babel from 'rollup-plugin-babel';
+import resolve from 'rollup-plugin-node-resolve';
+import commonjs from 'rollup-plugin-commonjs';
+import { terser } from 'rollup-plugin-terser';
+import replace from 'rollup-plugin-replace';
+
+module.exports = {
+    input: 'lib/html-spa/src/index.js',
+    output: {
+        file: 'lib/html-spa/assets/bundle.js',
+        format: 'iife'
+    },
+    plugins: [
+        babel({
+            exclude: 'node_modules/**'
+        }),
+        resolve(),
+        commonjs({
+            namedExports: {
+                'react/index.js': [
+                    'createElement',
+                    'Fragment',
+                    'useState',
+                    'useMemo',
+                    'useEffect'
+                ],
+                'react-dom/index.js': ['render', 'unstable_batchedUpdates']
+            }
+        }),
+        replace({
+            'process.env.NODE_ENV': JSON.stringify('production')
+        }),
+        // use fast minify mode https://github.com/terser-js/terser#terser-fast-minify-mode
+        terser({
+            compress: false,
+            mangle: true,
+            output: {
+                preamble: '/* eslint-disable */\n'
+            }
+        })
+    ]
+};
diff --git a/packages/istanbul-reports/lib/html-spa/src/filterButtons.js b/packages/istanbul-reports/lib/html-spa/src/filterButtons.js
new file mode 100644
index 00000000..0fa8bb18
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/filterButtons.js
@@ -0,0 +1,48 @@
+import React from 'react';
+
+function FilterButton({ children, filter, activeFilters, setFilters }) {
+    return (
+        <button
+            className={
+                'togglebutton ' + (activeFilters[filter] ? 'enabled' : '')
+            }
+            onClick={() =>
+                setFilters({
+                    ...activeFilters,
+                    [filter]: !activeFilters[filter]
+                })
+            }
+        >
+            {children}
+        </button>
+    );
+}
+
+export default function FilterButtons({ activeFilters, setFilters }) {
+    return (
+        <div className="buttongroup">
+            <label>Coverage:</label>
+            <FilterButton
+                filter="low"
+                activeFilters={activeFilters}
+                setFilters={setFilters}
+            >
+                Low
+            </FilterButton>
+            <FilterButton
+                filter="medium"
+                activeFilters={activeFilters}
+                setFilters={setFilters}
+            >
+                Medium
+            </FilterButton>
+            <FilterButton
+                filter="high"
+                activeFilters={activeFilters}
+                setFilters={setFilters}
+            >
+                High
+            </FilterButton>
+        </div>
+    );
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/flattenButton.js b/packages/istanbul-reports/lib/html-spa/src/flattenButton.js
new file mode 100644
index 00000000..d503c6c9
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/flattenButton.js
@@ -0,0 +1,14 @@
+import React from 'react';
+
+export default function FlattenButton({ setIsFlat, isFlat }) {
+    return (
+        <div className="buttongroup">
+            <button
+                onClick={() => setIsFlat(!isFlat)}
+                className={'togglebutton ' + (isFlat ? 'enabled' : '')}
+            >
+                Flat
+            </button>
+        </div>
+    );
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/getChildData.js b/packages/istanbul-reports/lib/html-spa/src/getChildData.js
new file mode 100644
index 00000000..8b09b327
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/getChildData.js
@@ -0,0 +1,152 @@
+function addPath(node, parentPath) {
+    if (!parentPath) {
+        return node;
+    }
+    return { ...node, file: parentPath + '/' + node.file };
+}
+
+function flatten(nodes, parentPath) {
+    let children = [];
+    for (let i = 0; i < nodes.length; i++) {
+        const child = nodes[i];
+        if (child.children) {
+            children = [
+                ...children,
+                ...flatten(
+                    child.children,
+                    (parentPath ? parentPath + '/' : '') + child.file
+                )
+            ];
+        } else {
+            children.push(addPath(child, parentPath));
+        }
+    }
+    return children;
+}
+
+function filterByFile(nodes, fileFilter, parentPath) {
+    let children = [];
+
+    for (let i = 0; i < nodes.length; i++) {
+        const child = nodes[i];
+        const childFullPath = (parentPath ? parentPath + '/' : '') + child.file;
+        if (
+            childFullPath === fileFilter ||
+            childFullPath.indexOf(fileFilter) < 0
+        ) {
+            if (fileFilter.indexOf(childFullPath) === 0) {
+                // flatten
+                children = [
+                    ...children,
+                    ...filterByFile(child.children, fileFilter, childFullPath)
+                ];
+            }
+        } else {
+            const charsToRemoveFromFile =
+                fileFilter.length - (parentPath ? parentPath.length : 0);
+            let childFilename = child.file.slice(charsToRemoveFromFile);
+            if (childFilename[0] === '/') {
+                childFilename = childFilename.slice(1);
+            }
+            children.push({
+                ...child,
+                file: childFilename
+            });
+        }
+    }
+    return children;
+}
+
+function sort(childData, activeSort) {
+    const top = activeSort.order === 'asc' ? 1 : -1;
+    const bottom = activeSort.order === 'asc' ? -1 : 1;
+    childData.sort((a, b) => {
+        let valueA;
+        let valueB;
+        if (activeSort.sortKey === 'file') {
+            valueA = a.file;
+            valueB = b.file;
+        } else {
+            const [metricType, valueType] = activeSort.sortKey.split('.');
+            valueA = a.metrics[metricType][valueType];
+            valueB = b.metrics[metricType][valueType];
+        }
+
+        if (valueA === valueB) {
+            return 0;
+        }
+        return valueA < valueB ? top : bottom;
+    });
+
+    for (let i = 0; i < childData.length; i++) {
+        const child = childData[i];
+        if (child.children) {
+            childData[i] = {
+                ...child,
+                children: sort(child.children, activeSort)
+            };
+        }
+    }
+    return childData;
+}
+
+function filter(nodes, metricsMap, activeFilters) {
+    const children = [];
+    for (let i = 0; i < nodes.length; i++) {
+        let child = nodes[i];
+        if (child.children) {
+            const newSubChildren = filter(
+                child.children,
+                metricsMap,
+                activeFilters
+            );
+            if (newSubChildren.length) {
+                child = { ...child, children: newSubChildren };
+                children.push(child);
+            }
+        } else {
+            if (
+                (metricsMap.statements &&
+                    activeFilters[child.metrics.statements.classForPercent]) ||
+                (metricsMap.branches &&
+                    activeFilters[child.metrics.branches.classForPercent]) ||
+                (metricsMap.functions &&
+                    activeFilters[child.metrics.functions.classForPercent]) ||
+                (metricsMap.lines &&
+                    activeFilters[child.metrics.lines.classForPercent])
+            ) {
+                children.push(child);
+            }
+        }
+    }
+    return children;
+}
+
+export default function getChildData(
+    sourceData,
+    metricsToShow,
+    activeSort,
+    isFlat,
+    activeFilters,
+    fileFilter
+) {
+    let childData = sourceData.children;
+
+    if (isFlat) {
+        childData = flatten(childData.slice(0));
+    }
+
+    if (fileFilter) {
+        childData = filterByFile(childData, fileFilter);
+    }
+
+    if (activeFilters.low) {
+        activeFilters = { ...activeFilters, empty: true };
+    }
+    childData = filter(childData, metricsToShow, activeFilters);
+
+    if (activeSort) {
+        childData = sort(childData, activeSort);
+    }
+    return childData;
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/index.js b/packages/istanbul-reports/lib/html-spa/src/index.js
new file mode 100644
index 00000000..46a3807f
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/index.js
@@ -0,0 +1,153 @@
+// The index file for the spa running on the summary page
+import React, { useState, useMemo, useEffect } from 'react';
+import ReactDOM from 'react-dom';
+import SummaryTableHeader from './summaryTableHeader';
+import SummaryTableLine from './summaryTableLine';
+import SummaryHeader from './summaryHeader';
+import getChildData from './getChildData';
+import FlattenButton from './flattenButton';
+import FilterButtons from './filterButtons';
+import { setLocation, decodeLocation } from './routing';
+
+const sourceData = window.data;
+const metricsToShow = {};
+for (let i = 0; i < window.metricsToShow.length; i++) {
+    metricsToShow[window.metricsToShow[i]] = true;
+}
+
+let firstMount = true;
+
+function App() {
+    const routingDefaults = decodeLocation();
+
+    const [activeSort, setSort] = useState(
+        (routingDefaults && routingDefaults.activeSort) || {
+            sortKey: 'file',
+            order: 'desc'
+        }
+    );
+    const [isFlat, setIsFlat] = useState(
+        (routingDefaults && routingDefaults.isFlat) || false
+    );
+    const [activeFilters, setFilters] = useState(
+        (routingDefaults && routingDefaults.activeFilters) || {
+            low: true,
+            medium: true,
+            high: true
+        }
+    );
+    const [expandedLines, setExpandedLines] = useState(
+        (routingDefaults && routingDefaults.expandedLines) || []
+    );
+    const [fileFilter, setFileFilter] = useState(
+        (routingDefaults && routingDefaults.fileFilter) || ''
+    );
+    const childData = useMemo(
+        () =>
+            getChildData(
+                sourceData,
+                metricsToShow,
+                activeSort,
+                isFlat,
+                activeFilters,
+                fileFilter
+            ),
+        [activeSort, isFlat, activeFilters, fileFilter]
+    );
+    const overallMetrics = sourceData.metrics;
+
+    useEffect(() => {
+        setLocation(
+            firstMount,
+            activeSort,
+            isFlat,
+            activeFilters,
+            fileFilter,
+            expandedLines
+        );
+        firstMount = false;
+    }, [activeSort, isFlat, activeFilters, fileFilter, expandedLines]);
+
+    useEffect(() => {
+        window.onpopstate = () => {
+            const routingState = decodeLocation();
+            if (routingState) {
+                // make sure all the state is set before rendering to avoid url updates
+                // alternative is to merge all the states into one so it can be set in one go
+                // https://github.com/facebook/react/issues/14259
+                ReactDOM.unstable_batchedUpdates(() => {
+                    setFilters(routingState.activeFilters);
+                    setSort(routingState.activeSort);
+                    setIsFlat(routingState.isFlat);
+                    setExpandedLines(routingState.expandedLines);
+                    setFileFilter(routingState.fileFilter);
+                });
+            }
+        };
+    }, []);
+
+    return (
+        <>
+            <div className="body">
+                <SummaryHeader
+                    metrics={overallMetrics}
+                    metricsToShow={metricsToShow}
+                />
+                {Boolean(fileFilter) && (
+                    <div className="pad1">
+                        <h1>
+                            {fileFilter} (
+                            <a
+                                href="javascript:void()"
+                                onClick={() => setFileFilter('')}
+                            >
+                                Clear
+                            </a>
+                            )
+                        </h1>
+                    </div>
+                )}
+                <div className="pad1">
+                    <FlattenButton setIsFlat={setIsFlat} isFlat={isFlat} />
+                    <FilterButtons
+                        activeFilters={activeFilters}
+                        setFilters={setFilters}
+                    />
+                </div>
+                <div className="pad1">
+                    <table className="coverage-summary">
+                        <SummaryTableHeader
+                            onSort={newSort => {
+                                setSort(newSort);
+                            }}
+                            activeSort={activeSort}
+                            metricsToShow={metricsToShow}
+                        />
+                        <tbody>
+                            {childData.map(child => (
+                                <SummaryTableLine
+                                    {...child}
+                                    key={child.file}
+                                    metricsToShow={metricsToShow}
+                                    expandedLines={expandedLines}
+                                    setExpandedLines={setExpandedLines}
+                                    fileFilter={fileFilter}
+                                    setFileFilter={setFileFilter}
+                                />
+                            ))}
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+            <div className="footer quiet pad2 space-top1 center small">
+                Code coverage generated by{' '}
+                <a href="https://istanbul.js.org/" target="_blank">
+                    istanbul
+                </a>{' '}
+                at {window.generatedDatetime}
+            </div>
+        </>
+    );
+}
+
+ReactDOM.render(<App />, document.getElementById('app'));
diff --git a/packages/istanbul-reports/lib/html-spa/src/routing.js b/packages/istanbul-reports/lib/html-spa/src/routing.js
new file mode 100644
index 00000000..ae640eef
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/routing.js
@@ -0,0 +1,52 @@
+export function setLocation(
+    isReplace,
+    activeSort,
+    isFlat,
+    activeFilters,
+    fileFilter,
+    expandedLines
+) {
+    const params = [
+        activeSort.sortKey,
+        activeSort.order,
+        isFlat,
+        activeFilters.low,
+        activeFilters.medium,
+        activeFilters.high,
+        encodeURIComponent(fileFilter),
+        expandedLines.map(encodeURIComponent).join(',')
+    ];
+    const newUrl = `#${params.join('/')}`;
+
+    if (newUrl === location.hash) {
+        return;
+    }
+
+    window.history[isReplace ? 'replaceState' : 'pushState'](null, '', newUrl);
+}
+
+export function decodeLocation() {
+    const items = location.hash.substr(1).split('/');
+    if (items.length !== 8) {
+        return null;
+    }
+
+    try {
+        return {
+            activeSort: {
+                sortKey: items[0],
+                order: items[1]
+            },
+            isFlat: JSON.parse(items[2]),
+            activeFilters: {
+                low: JSON.parse(items[3]),
+                medium: JSON.parse(items[4]),
+                high: JSON.parse(items[5])
+            },
+            fileFilter: decodeURIComponent(items[6]),
+            expandedLines: items[7].split(',').map(decodeURIComponent)
+        };
+    } catch (e) {
+        return null;
+    }
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/summaryHeader.js b/packages/istanbul-reports/lib/html-spa/src/summaryHeader.js
new file mode 100644
index 00000000..e45e39d9
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/summaryHeader.js
@@ -0,0 +1,67 @@
+import React from 'react';
+
+function Ignores({ metrics, metricsToShow }) {
+    const metricKeys = Object.keys(metricsToShow);
+    const result = [];
+
+    for (let i = 0; i < metricKeys.length; i++) {
+        const metricKey = metricKeys[i];
+        if (metricsToShow[metricKey]) {
+            const skipped = metrics[metricKey].skipped;
+            if (skipped > 0) {
+                result.push(
+                    `${skipped} ${metricKey}${
+                        skipped === 1 ? '' : metricKey === 'branch' ? 'es' : 's'
+                    }`
+                );
+            }
+        }
+    }
+
+    if (result.length === 0) {
+        return false;
+    }
+
+    return (
+        <div className="fl pad1y">
+            <span className="strong">{result.join(', ')}</span>
+            <span className="quiet">Ignored</span>
+        </div>
+    );
+}
+
+function StatusMetric({ data, name }) {
+    return (
+        <div className="fl pad1y space-right2">
+            <span className="strong">{data.pct}% </span>
+            <span className="quiet">{name}</span>{' '}
+            <span className={'fraction ' + data.classForPercent}>
+                {data.covered}/{data.total}
+            </span>
+        </div>
+    );
+}
+
+export default function SummaryHeader({ metrics, metricsToShow }) {
+    return (
+        <div className="pad1">
+            {/* TODO - <h1>All Files</h1> - this doesn't add useful info any more. if anything it should be the name of the project - coverage*/}
+            <div className="clearfix">
+                {metricsToShow.statements && (
+                    <StatusMetric data={metrics.statements} name="Statements" />
+                )}
+                {metricsToShow.branches && (
+                    <StatusMetric data={metrics.branches} name="Branches" />
+                )}
+                {metricsToShow.functions && (
+                    <StatusMetric data={metrics.functions} name="Functions" />
+                )}
+                {metricsToShow.lines && (
+                    <StatusMetric data={metrics.lines} name="Lines" />
+                )}
+
+                <Ignores metrics={metrics} metricsToShow={metricsToShow} />
+            </div>
+        </div>
+    );
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/summaryTableHeader.js b/packages/istanbul-reports/lib/html-spa/src/summaryTableHeader.js
new file mode 100644
index 00000000..87fa81bb
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/summaryTableHeader.js
@@ -0,0 +1,123 @@
+import React from 'react';
+
+function getSortDetails(sortKey, activeSort) {
+    let newSort = { sortKey, order: 'desc' };
+    let sortClass = '';
+    if (activeSort && activeSort.sortKey === sortKey) {
+        sortClass = 'sorted';
+        if (activeSort.order === 'desc') {
+            sortClass += '-desc';
+            newSort.order = 'asc';
+        } else {
+            if (sortKey !== 'file') {
+                newSort = { sortKey: 'file', order: 'desc' };
+            }
+        }
+    }
+
+    return {
+        newSort,
+        sortClass
+    };
+}
+
+function SummaryTableHeaderCell({ name, onSort, sortKey, activeSort }) {
+    const { newSort, sortClass } = getSortDetails(sortKey, activeSort);
+    return (
+        <th
+            className={'sortable headercell ' + sortClass}
+            onClick={() => onSort(newSort)}
+        >
+            {name}
+            <span className="sorter" />
+        </th>
+    );
+}
+
+function FileHeaderCell({ onSort, activeSort }) {
+    const { newSort, sortClass } = getSortDetails('file', activeSort);
+
+    return (
+        <th
+            className={'sortable file ' + sortClass}
+            onClick={() => onSort(newSort)}
+        >
+            File
+            <span className="sorter" />
+        </th>
+    );
+}
+
+function SubHeadings({ sortKeyPrefix, onSort, activeSort }) {
+    return (
+        <>
+            <SummaryTableHeaderCell
+                name="%"
+                onSort={onSort}
+                sortKey={sortKeyPrefix + '.pct'}
+                activeSort={activeSort}
+            />
+            <SummaryTableHeaderCell
+                name="Covered"
+                onSort={onSort}
+                sortKey={sortKeyPrefix + '.covered'}
+                activeSort={activeSort}
+            />
+            <SummaryTableHeaderCell
+                name="Total"
+                onSort={onSort}
+                sortKey={sortKeyPrefix + '.total'}
+                activeSort={activeSort}
+            />
+        </>
+    );
+}
+
+export default function SummaryTableHeader({
+    onSort,
+    activeSort,
+    metricsToShow
+}) {
+    return (
+        <thead>
+            <tr className="topheading">
+                <FileHeaderCell onSort={onSort} activeSort={activeSort} />
+                {metricsToShow.statements && <th colSpan={3}>Statements</th>}
+                {metricsToShow.branches && <th colSpan={3}>Branches</th>}
+                {metricsToShow.functions && <th colSpan={3}>Functions</th>}
+                {metricsToShow.lines && <th colSpan={3}>Lines</th>}
+            </tr>
+            <tr className="subheading">
+                <th />
+                {metricsToShow.statements && (
+                    <SubHeadings
+                        sortKeyPrefix="statements"
+                        onSort={onSort}
+                        activeSort={activeSort}
+                    />
+                )}
+                {metricsToShow.branches && (
+                    <SubHeadings
+                        sortKeyPrefix="branches"
+                        onSort={onSort}
+                        activeSort={activeSort}
+                    />
+                )}
+                {metricsToShow.functions && (
+                    <SubHeadings
+                        sortKeyPrefix="functions"
+                        onSort={onSort}
+                        activeSort={activeSort}
+                    />
+                )}
+                {metricsToShow.lines && (
+                    <SubHeadings
+                        sortKeyPrefix="lines"
+                        onSort={onSort}
+                        activeSort={activeSort}
+                    />
+                )}
+            </tr>
+        </thead>
+    );
+}
diff --git a/packages/istanbul-reports/lib/html-spa/src/summaryTableLine.js b/packages/istanbul-reports/lib/html-spa/src/summaryTableLine.js
new file mode 100644
index 00000000..a1460750
--- /dev/null
+++ b/packages/istanbul-reports/lib/html-spa/src/summaryTableLine.js
@@ -0,0 +1,188 @@
+import React from 'react';
+
+function ShowPicture({ num }) {
+    let rest;
+    let cls = '';
+    if (isFinite(num)) {
+        if (num === 100) {
+            cls = ' cover-full';
+        }
+        num = Math.floor(num);
+        rest = 100 - num;
+        return (
+            <>
+                <div
+                    className={'cover-fill' + cls}
+                    style={{ width: num + '%' }}
+                />
+                <div className="cover-empty" style={{ width: rest + '%' }} />
+            </>
+        );
+    } else {
+        return false;
+    }
+}
+
+function MetricCells({ metrics }) {
+    return (
+        <>
+            <td className={'pct ' + metrics.classForPercent}>{metrics.pct}%</td>
+            <td className={'abs ' + metrics.classForPercent}>
+                {metrics.covered}
+            </td>
+            <td className={'abs ' + metrics.classForPercent}>
+                {metrics.total}
+            </td>
+        </>
+    );
+}
+
+function FileCell({
+    file,
+    prefix,
+    expandedLines,
+    setExpandedLines,
+    hasChildren,
+    setFileFilter
+}) {
+    if (hasChildren) {
+        const expandedIndex = expandedLines.indexOf(prefix + file);
+        const isExpanded = expandedIndex >= 0;
+        const newExpandedLines = isExpanded
+            ? [
+                  ...expandedLines.slice(0, expandedIndex),
+                  ...expandedLines.slice(expandedIndex + 1)
+              ]
+            : [...expandedLines, prefix + file];
+
+        return (
+            <>
+                <button
+                    type="button"
+                    onClick={() => setExpandedLines(newExpandedLines)}
+                    className="expandbutton"
+                >
+                    {isExpanded ? String.fromCharCode(0x2013) : '+'}
+                </button>
+                <a
+                    href="javascript:void(0)"
+                    onClick={() => setFileFilter(prefix + file)}
+                >
+                    {file}
+                </a>
+            </>
+        );
+    } else {
+        return <a href={`./${prefix}${file}.html`}>{file}</a>;
+    }
+}
+
+export default function SummaryTableLine({
+    prefix,
+    metrics,
+    file,
+    children,
+    tabSize,
+    metricsToShow,
+    expandedLines,
+    setExpandedLines,
+    fileFilter,
+    setFileFilter
+}) {
+    tabSize = tabSize || 0;
+    if (children && tabSize > 0) {
+        tabSize--;
+    }
+    prefix = (fileFilter ? fileFilter + '/' : '') + (prefix || '');
+
+    return (
+        <>
+            <tr>
+                <td
+                    className={'file ' + metrics.statements.classForPercent}
+                    rowSpan={2}
+                >
+                    {/* eslint-disable-line prefer-spread */ Array.apply(null, {
+                        length: tabSize
+                    }).map((nothing, index) => (
+                        <span className="filetab" key={index} />
+                    ))}
+                    <FileCell
+                        file={file}
+                        prefix={prefix}
+                        expandedLines={expandedLines}
+                        setExpandedLines={setExpandedLines}
+                        hasChildren={Boolean(children)}
+                        setFileFilter={setFileFilter}
+                    />
+                </td>
+                {metricsToShow.statements && (
+                    <MetricCells metrics={metrics.statements} />
+                )}
+                {metricsToShow.branches && (
+                    <MetricCells metrics={metrics.branches} />
+                )}
+                {metricsToShow.functions && (
+                    <MetricCells metrics={metrics.functions} />
+                )}
+                {metricsToShow.lines && <MetricCells metrics={metrics.lines} />}
+            </tr>
+            <tr>
+                {metricsToShow.statements && (
+                    <td
+                        className={'pic ' + metrics.statements.classForPercent}
+                        colSpan={3}
+                    >
+                        <div className="chart">
+                            <ShowPicture num={metrics.statements.pct} />
+                        </div>
+                    </td>
+                )}
+                {metricsToShow.branches && (
+                    <td
+                        className={'pic ' + metrics.branches.classForPercent}
+                        colSpan={3}
+                    >
+                        <div className="chart">
+                            <ShowPicture num={metrics.branches.pct} />
+                        </div>
+                    </td>
+                )}
+                {metricsToShow.functions && (
+                    <td
+                        className={'pic ' + metrics.functions.classForPercent}
+                        colSpan={3}
+                    >
+                        <div className="chart">
+                            <ShowPicture num={metrics.functions.pct} />
+                        </div>
+                    </td>
+                )}
+                {metricsToShow.lines && (
+                    <td
+                        className={'pic ' + metrics.lines.classForPercent}
+                        colSpan={3}
+                    >
+                        <div className="chart">
+                            <ShowPicture num={metrics.lines.pct} />
+                        </div>
+                    </td>
+                )}
+            </tr>
+            {children &&
+                expandedLines.indexOf(prefix + file) >= 0 &&
+                children.map(child => (
+                    <SummaryTableLine
+                        {...child}
+                        tabSize={tabSize + 2}
+                        key={child.file}
+                        prefix={prefix + file + '/'}
+                        metricsToShow={metricsToShow}
+                        expandedLines={expandedLines}
+                        setExpandedLines={setExpandedLines}
+                        setFileFilter={setFileFilter}
+                    />
+                ))}
+        </>
+    );
+}
diff --git a/packages/istanbul-reports/package-lock.json b/packages/istanbul-reports/package-lock.json
index a9156dbb..84954ea8 100644
--- a/packages/istanbul-reports/package-lock.json
+++ b/packages/istanbul-reports/package-lock.json
@@ -1,14 +1,1401 @@
 {
 	"name": "istanbul-reports",
-	"version": "2.2.3",
+	"version": "2.2.4",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
+		"@babel/code-frame": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+			"integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+			"dev": true,
+			"requires": {
+				"@babel/highlight": "^7.0.0"
+			}
+		},
+		"@babel/core": {
+			"version": "7.4.0",
+			"resolved": "https://registry.npmjs.org/@babel/core/-/core-7.4.0.tgz",
+			"integrity": "sha512-Dzl7U0/T69DFOTwqz/FJdnOSWS57NpjNfCwMKHABr589Lg8uX1RrlBIJ7L5Dubt/xkLsx0xH5EBFzlBVes1ayA==",
+			"dev": true,
+			"requires": {
+				"@babel/code-frame": "^7.0.0",
+				"@babel/generator": "^7.4.0",
+				"@babel/helpers": "^7.4.0",
+				"@babel/parser": "^7.4.0",
+				"@babel/template": "^7.4.0",
+				"@babel/traverse": "^7.4.0",
+				"@babel/types": "^7.4.0",
+				"convert-source-map": "^1.1.0",
+				"debug": "^4.1.0",
+				"json5": "^2.1.0",
+				"lodash": "^4.17.11",
+				"resolve": "^1.3.2",
+				"semver": "^5.4.1",
+				"source-map": "^0.5.0"
+			},
+			"dependencies": {
+				"source-map": {
+					"version": "0.5.7",
+					"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+					"integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+					"dev": true
+				}
+			}
+		},
+		"@babel/generator": {
+			"version": "7.4.0",
+			"resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.0.tgz",
+			"integrity": "sha512-/v5I+a1jhGSKLgZDcmAUZ4K/VePi43eRkUs3yePW1HB1iANOD5tqJXwGSG4BZhSksP8J9ejSlwGeTiiOFZOrXQ==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.4.0",
+				"jsesc": "^2.5.1",
+				"lodash": "^4.17.11",
+				"source-map": "^0.5.0",
+				"trim-right": "^1.0.1"
+			},
+			"dependencies": {
+				"source-map": {
+					"version": "0.5.7",
+					"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+					"integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+					"dev": true
+				}
+			}
+		},
+		"@babel/helper-annotate-as-pure": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.0.0.tgz",
+			"integrity": "sha512-3UYcJUj9kvSLbLbUIfQTqzcy5VX7GRZ/CCDrnOaZorFFM01aXp1+GJwuFGV4NDDoAS+mOUyHcO6UD/RfqOks3Q==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-builder-binary-assignment-operator-visitor": {
+			"version": "7.1.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.1.0.tgz",
+			"integrity": "sha512-qNSR4jrmJ8M1VMM9tibvyRAHXQs2PmaksQF7c1CGJNipfe3D8p+wgNwgso/P2A2r2mdgBWAXljNWR0QRZAMW8w==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-explode-assignable-expression": "^7.1.0",
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-builder-react-jsx": {
+			"version": "7.3.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-builder-react-jsx/-/helper-builder-react-jsx-7.3.0.tgz",
+			"integrity": "sha512-MjA9KgwCuPEkQd9ncSXvSyJ5y+j2sICHyrI0M3L+6fnS4wMSNDc1ARXsbTfbb2cXHn17VisSnU/sHFTCxVxSMw==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.3.0",
+				"esutils": "^2.0.0"
+			}
+		},
+		"@babel/helper-call-delegate": {
+			"version": "7.4.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-call-delegate/-/helper-call-delegate-7.4.0.tgz",
+			"integrity": "sha512-SdqDfbVdNQCBp3WhK2mNdDvHd3BD6qbmIc43CAyjnsfCmgHMeqgDcM3BzY2lchi7HBJGJ2CVdynLWbezaE4mmQ==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-hoist-variables": "^7.4.0",
+				"@babel/traverse": "^7.4.0",
+				"@babel/types": "^7.4.0"
+			}
+		},
+		"@babel/helper-define-map": {
+			"version": "7.4.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-define-map/-/helper-define-map-7.4.0.tgz",
+			"integrity": "sha512-wAhQ9HdnLIywERVcSvX40CEJwKdAa1ID4neI9NXQPDOHwwA+57DqwLiPEVy2AIyWzAk0CQ8qx4awO0VUURwLtA==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-function-name": "^7.1.0",
+				"@babel/types": "^7.4.0",
+				"lodash": "^4.17.11"
+			}
+		},
+		"@babel/helper-explode-assignable-expression": {
+			"version": "7.1.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-explode-assignable-expression/-/helper-explode-assignable-expression-7.1.0.tgz",
+			"integrity": "sha512-NRQpfHrJ1msCHtKjbzs9YcMmJZOg6mQMmGRB+hbamEdG5PNpaSm95275VD92DvJKuyl0s2sFiDmMZ+EnnvufqA==",
+			"dev": true,
+			"requires": {
+				"@babel/traverse": "^7.1.0",
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-function-name": {
+			"version": "7.1.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+			"integrity": "sha512-A95XEoCpb3TO+KZzJ4S/5uW5fNe26DjBGqf1o9ucyLyCmi1dXq/B3c8iaWTfBk3VvetUxl16e8tIrd5teOCfGw==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-get-function-arity": "^7.0.0",
+				"@babel/template": "^7.1.0",
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-get-function-arity": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+			"integrity": "sha512-r2DbJeg4svYvt3HOS74U4eWKsUAMRH01Z1ds1zx8KNTPtpTL5JAsdFv8BNyOpVqdFhHkkRDIg5B4AsxmkjAlmQ==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-hoist-variables": {
+			"version": "7.4.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-hoist-variables/-/helper-hoist-variables-7.4.0.tgz",
+			"integrity": "sha512-/NErCuoe/et17IlAQFKWM24qtyYYie7sFIrW/tIQXpck6vAu2hhtYYsKLBWQV+BQZMbcIYPU/QMYuTufrY4aQw==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.4.0"
+			}
+		},
+		"@babel/helper-member-expression-to-functions": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.0.0.tgz",
+			"integrity": "sha512-avo+lm/QmZlv27Zsi0xEor2fKcqWG56D5ae9dzklpIaY7cQMK5N8VSpaNVPPagiqmy7LrEjK1IWdGMOqPu5csg==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-module-imports": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz",
+			"integrity": "sha512-aP/hlLq01DWNEiDg4Jn23i+CXxW/owM4WpDLFUbpjxe4NS3BhLVZQ5i7E0ZrxuQ/vwekIeciyamgB1UIYxxM6A==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-module-transforms": {
+			"version": "7.4.3",
+			"resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.4.3.tgz",
+			"integrity": "sha512-H88T9IySZW25anu5uqyaC1DaQre7ofM+joZtAaO2F8NBdFfupH0SZ4gKjgSFVcvtx/aAirqA9L9Clio2heYbZA==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-module-imports": "^7.0.0",
+				"@babel/helper-simple-access": "^7.1.0",
+				"@babel/helper-split-export-declaration": "^7.0.0",
+				"@babel/template": "^7.2.2",
+				"@babel/types": "^7.2.2",
+				"lodash": "^4.17.11"
+			}
+		},
+		"@babel/helper-optimise-call-expression": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.0.0.tgz",
+			"integrity": "sha512-u8nd9NQePYNQV8iPWu/pLLYBqZBa4ZaY1YWRFMuxrid94wKI1QNt67NEZ7GAe5Kc/0LLScbim05xZFWkAdrj9g==",
+			"dev": true,
+			"requires": {
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-plugin-utils": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
+			"integrity": "sha512-CYAOUCARwExnEixLdB6sDm2dIJ/YgEAKDM1MOeMeZu9Ld/bDgVo8aiWrXwcY7OBh+1Ea2uUcVRcxKk0GJvW7QA==",
+			"dev": true
+		},
+		"@babel/helper-regex": {
+			"version": "7.4.3",
+			"resolved": "https://registry.npmjs.org/@babel/helper-regex/-/helper-regex-7.4.3.tgz",
+			"integrity": "sha512-hnoq5u96pLCfgjXuj8ZLX3QQ+6nAulS+zSgi6HulUwFbEruRAKwbGLU5OvXkE14L8XW6XsQEKsIDfgthKLRAyA==",
+			"dev": true,
+			"requires": {
+				"lodash": "^4.17.11"
+			}
+		},
+		"@babel/helper-remap-async-to-generator": {
+			"version": "7.1.0",
+			"resolved": "https://registry.npmjs.org/@babel/helper-remap-async-to-generator/-/helper-remap-async-to-generator-7.1.0.tgz",
+			"integrity": "sha512-3fOK0L+Fdlg8S5al8u/hWE6vhufGSn0bN09xm2LXMy//REAF8kDCrYoOBKYmA8m5Nom+sV9LyLCwrFynA8/slg==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-annotate-as-pure": "^7.0.0",
+				"@babel/helper-wrap-function": "^7.1.0",
+				"@babel/template": "^7.1.0",
+				"@babel/traverse": "^7.1.0",
+				"@babel/types": "^7.0.0"
+			}
+		},
+		"@babel/helper-replace-supers": {
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index 7e9f0f62..d25e1a4c 100644
--- a/packages/istanbul-reports/package.json
+++ b/packages/istanbul-reports/package.json
@@ -9,14 +9,26 @@
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   ],
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index bb748986..21a0236a 100644
--- a/packages/istanbul-reports/test/fixtures/specs/100-line-100-branch.json
+++ b/packages/istanbul-reports/test/fixtures/specs/100-line-100-branch.json
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+            "hash": "257c6f21b24c87c5486d0ac83455acd3e4aebb6d",
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 }
diff --git a/packages/istanbul-reports/test/html-spa/index.js b/packages/istanbul-reports/test/html-spa/index.js
new file mode 100644
index 00000000..caead784
--- /dev/null
+++ b/packages/istanbul-reports/test/html-spa/index.js
@@ -0,0 +1,179 @@
+/* globals describe, it, afterEach, before, after */
+const fs = require('fs');
+const path = require('path');
+const FileWriter = require('istanbul-lib-report/lib/file-writer');
+const istanbulLibReport = require('istanbul-lib-report');
+const istanbulLibCoverage = require('istanbul-lib-coverage');
+const HtmlSpaReport = require('../../lib/html-spa/index');
+
+const assert = require('chai').assert;
+
+describe('html-spa', () => {
+    let fileWriterCopyFile;
+    let fileWriterWriteFile;
+    let operations = [];
+    before(() => {
+        fileWriterCopyFile = FileWriter.prototype.copyFile;
+        fileWriterWriteFile = FileWriter.prototype.writeFile;
+
+        FileWriter.prototype.copyFile = function(source, dest, header) {
+            operations.push({
+                type: 'copy',
+                source,
+                dest,
+                header
+            });
+        };
+        FileWriter.prototype.writeFile = function(file) {
+            const writeFileOp = {
+                type: 'write',
+                contents: '',
+                file,
+                baseDir: this.baseDir
+            };
+            operations.push(writeFileOp);
+            return {
+                write(str) {
+                    writeFileOp.contents += str;
+                },
+                close() {}
+            };
+        };
+    });
+    afterEach(() => {
+        operations = [];
+    });
+    after(() => {
+        FileWriter.prototype.copyFile = fileWriterCopyFile;
+        FileWriter.prototype.writeFile = fileWriterWriteFile;
+    });
+
+    function createTest(file) {
+        const fixture = require(path.resolve(
+            __dirname,
+            '../fixtures/specs/' + file
+        ));
+        const tree = istanbulLibReport.summarizers.nested(
+            istanbulLibCoverage.createCoverageMap(fixture.map)
+        );
+        it(fixture.title, () => {
+            const context = istanbulLibReport.createContext({
+                dir: './'
+            });
+            const report = new HtmlSpaReport(fixture.opts);
+            tree.visit(report, context);
+
+            // copy operations should always be the same
+            assert.deepEqual(operations.filter(op => op.type === 'copy'), [
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/base.css'
+                    ),
+                    dest: './base.css',
+                    header: undefined
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/block-navigation.js'
+                    ),
+                    dest: './block-navigation.js',
+                    header: '/* eslint-disable */\n'
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/sort-arrow-sprite.png'
+                    ),
+                    dest: './sort-arrow-sprite.png',
+                    header: undefined
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/sorter.js'
+                    ),
+                    dest: './sorter.js',
+                    header: '/* eslint-disable */\n'
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/vendor/prettify.css'
+                    ),
+                    dest: './prettify.css',
+                    header: undefined
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html/assets/vendor/prettify.js'
+                    ),
+                    dest: './prettify.js',
+                    header: '/* eslint-disable */\n'
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html-spa/assets/bundle.js'
+                    ),
+                    dest: './bundle.js',
+                    header: undefined
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html-spa/assets/sort-arrow-sprite.png'
+                    ),
+                    dest: './sort-arrow-sprite.png',
+                    header: undefined
+                },
+                {
+                    type: 'copy',
+                    source: path.join(
+                        __dirname,
+                        '../../lib/html-spa/assets/spa.css'
+                    ),
+                    dest: './spa.css',
+                    header: undefined
+                }
+            ]);
+
+            assert.deepEqual(
+                operations
+                    .filter(op => op.type === 'write')
+                    .map(op => path.join(op.baseDir, op.file)),
+                fixture.htmlSpaFiles
+            );
+
+            assert.deepEqual(
+                JSON.parse(
+                    operations
+                        .filter(
+                            op =>
+                                op.type === 'write' && op.file === 'index.html'
+                        )[0]
+                        .contents.match(/window\.data = ([^;]+);/)[1]
+                ),
+                fixture.htmlSpaCoverageData
+            );
+        });
+    }
+
+    fs.readdirSync(path.resolve(__dirname, '../fixtures/specs')).forEach(
+        file => {
+            if (file.indexOf('.json') !== -1) {
+                createTest(file);
+            }
+        }
+    );
+});