Update json inplace

example/package.json

@@ -11,9 +11,9 @@
     "coverageThreshold": {
       "global": {
         "branches": 100,
-        "functions": 50,
-        "lines": 50,
-        "statements": 50
+        "functions": 75,
+        "lines": 75,
+        "statements": 75
       }
     },
     "reporters": [

package.json

@@ -60,6 +60,7 @@
     "typescript": "2.6.2"
   },
   "dependencies": {
+    "json-in-place": "1.0.1",
     "yargs-parser": "8.1.0"
   }
 }

src/index.test.ts

@@ -16,14 +16,10 @@ const mockConfig = {
   rootDir: './example',
 };
 
+jest.mock('fs');
+process.cwd = jest.fn().mockReturnValue(resolve('./example'));
+
 describe('jest-ratchet', () => {
-  beforeAll(() => {
-    jest.mock('fs');
-    process.cwd = jest.fn().mockReturnValue(resolve('./example'));
-  });
-  afterAll(() => {
-    jest.unmock('fs');
-  });
 
   it('will initialize without error', () => {
     const config = {

src/index.ts

@@ -1,13 +1,14 @@
-import { readFileSync, writeFileSync } from 'fs';
+import { readFileSync } from 'fs';
 
 import { getLastError } from './errors';
 import { Config, IstanbulCoverage, JestCoverage } from './interfaces';
+import { updateFile } from './json';
 import {
   findCoveragePath,
   findCoverageSummaryPath,
   findJestConfigPath,
 } from './locations';
-import { ratchetCoverage, setCoverage } from './ratchet';
+import { ratchetCoverage } from './ratchet';
 
 export default class JestRatchet {
   constructor(
@@ -29,14 +30,7 @@ export default class JestRatchet {
       const ratchetResult = ratchetCoverage(coverageThreshold, coverageSummary);
 
       const jestConfigPath = findJestConfigPath(process.cwd(), process.argv);
-      const jestConfigRaw = readFileSync(jestConfigPath, 'utf-8');
-      const jestConfig = JSON.parse(jestConfigRaw);
-      if (jestConfig.jest) {
-        setCoverage(jestConfig.jest.coverageThreshold, ratchetResult);
-      } else {
-        setCoverage(jestConfig.coverageThreshold, ratchetResult);
-      }
-      writeFileSync(jestConfigPath, JSON.stringify(jestConfig, null, 2), 'utf-8');
+      updateFile(jestConfigPath, ratchetResult);
     } catch (e) {
       // tslint:disable-next-line
       console.error(e);

src/json.test.ts

@@ -0,0 +1,38 @@
+import { setCoverage } from './json';
+
+const mockThreshold = {
+  global: {
+    branches: 80,
+    functions: 80,
+    lines: 80,
+    statements: 80,
+  },
+};
+
+jest.mock('fs');
+
+describe('json', () => {
+  it('will ratchet percents', () => {
+    const json = `
+    {
+      "coverageThreshold": {
+        "global": {
+          "branches": 50, "functions": 50,
+          "lines": 50, "statements": 50
+        }
+      }
+    }`;
+    const result = setCoverage(json, mockThreshold, '');
+
+    expect(result).toEqual(`
+    {
+      "coverageThreshold": {
+        "global": {
+          "branches": 80, "functions": 80,
+          "lines": 80, "statements": 80
+        }
+      }
+    }`);
+  });
+
+});

src/json.ts

@@ -0,0 +1,30 @@
+import { readFileSync, writeFileSync } from 'fs';
+import inplace = require('json-in-place');
+
+import { JestCoverage } from './interfaces';
+
+export function updateFile(fileName: string, result: JestCoverage) {
+  const jestConfigRaw = readFileSync(fileName, 'utf-8');
+  const jestConfig = JSON.parse(jestConfigRaw);
+
+  const prefix = jestConfig.jest ? 'jest.' : '';
+  const newFile = setCoverage(jestConfigRaw, result, prefix);
+
+  writeFileSync(fileName, newFile, 'utf-8');
+}
+
+export function setCoverage(
+  source: string,
+  result: JestCoverage,
+  prefix: string,
+): string {
+  prefix += 'coverageThreshold.';
+  const newSource = inplace(source);
+  for (const key of Object.keys(result)) {
+    newSource.set(prefix + key + '.branches', result[key].branches);
+    newSource.set(prefix + key + '.functions', result[key].functions);
+    newSource.set(prefix + key + '.lines', result[key].lines);
+    newSource.set(prefix + key + '.statements', result[key].statements);
+  }
+  return newSource.toString();
+}

src/ratchet.test.ts

@@ -1,4 +1,4 @@
-import { ratchetCoverage, setCoverage } from './ratchet';
+import { ratchetCoverage } from './ratchet';
 
 const mockCoverage = {
   total: {
@@ -51,50 +51,4 @@ describe('ratchet', () => {
     });
   });
 
-  it('will set coverage', () => {
-    const mockSource = {
-      global: {
-        branches: 50,
-        functions: 50,
-        lines: 50,
-        statements: 50,
-      },
-    };
-    const mockResult = {
-      global: {
-        branches: 80,
-        functions: 80,
-        lines: 80,
-        statements: 80,
-      },
-    };
-    setCoverage(mockSource, mockResult);
-
-    expect(mockSource.global.branches).toBe(80);
-    expect(mockSource.global.functions).toBe(80);
-    expect(mockSource.global.lines).toBe(80);
-    expect(mockSource.global.statements).toBe(80);
-  });
-
-  it('will set coverage for partial source', () => {
-    const mockSource: any = {
-      global: {
-        branches: 50,
-      },
-    };
-    const mockResult = {
-      global: {
-        branches: 80,
-        functions: 80,
-        lines: 80,
-        statements: 80,
-      },
-    };
-    setCoverage(mockSource, mockResult);
-
-    expect(mockSource.global.branches).toBe(80);
-    expect(mockSource.global.functions).toBe(80);
-    expect(mockSource.global.lines).toBe(80);
-    expect(mockSource.global.statements).toBe(80);
-  });
 });

src/ratchet.ts

@@ -6,24 +6,6 @@ import {
   JestCoverageCategory,
 } from './interfaces';
 
-export function setCoverage(
-  sourceCoverage: JestCoverage,
-  resultCoverage: JestCoverage,
-): void {
-  for (const key of Object.keys(sourceCoverage)) {
-    const source = sourceCoverage[key];
-    const result = resultCoverage[key];
-    source.branches = setSingleCoverage(source.branches, result.branches);
-    source.functions = setSingleCoverage(source.functions, result.functions);
-    source.lines = setSingleCoverage(source.lines, result.lines);
-    source.statements = setSingleCoverage(source.statements, result.statements);
-  }
-}
-
-function setSingleCoverage(sourceValue?: number, resultValue?: number) {
-  return typeof resultValue === 'number' ? resultValue : sourceValue;
-}
-
 export function ratchetCoverage(
   threshold: JestCoverage,
   summary: IstanbulCoverage,

yarn.lock

@@ -10,7 +10,7 @@
     esutils "^2.0.2"
     js-tokens "^3.0.0"
 
-"@types/jest@^22.0.1":
+"@types/jest@22.0.1":
   version "22.0.1"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-22.0.1.tgz#6370a6d60cce3845e4cd5d00bf65f654264685bc"
 
@@ -1596,7 +1596,7 @@ jest-worker@^22.0.6:
   dependencies:
     merge-stream "^1.0.1"
 
-jest@^22.0.6:
+jest@22.0.6:
   version "22.0.6"
   resolved "https://registry.yarnpkg.com/jest/-/jest-22.0.6.tgz#0d0d3bdc402c43cf5a3eae58a55cff6da8b6820f"
   dependencies:
@@ -1650,6 +1650,16 @@ jsesc@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-1.3.0.tgz#46c3fec8c1892b12b0833db9bc7622176dbab34b"
 
+json-in-place@1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/json-in-place/-/json-in-place-1.0.1.tgz#8a1ecd25a69ce1900552cd7152bd93754de4e1f0"
+  dependencies:
+    json-lexer "1.1.1"
+
+json-lexer@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/json-lexer/-/json-lexer-1.1.1.tgz#bd3ed5d7e560b9d99ad2234f28ca706fb377b7d4"
+
 json-schema-traverse@^0.3.0:
   version "0.3.1"
   resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.3.1.tgz#349a6d44c53a51de89b40805c5d5e59b417d3340"
@@ -2652,7 +2662,7 @@ trim-right@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
 
-ts-jest@^22.0.1:
+ts-jest@22.0.1:
   version "22.0.1"
   resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-22.0.1.tgz#48942936a466c2e76e259b02e2f1356f1839afc3"
   dependencies:
@@ -2671,7 +2681,7 @@ tslib@^1.8.0, tslib@^1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.8.1.tgz#6946af2d1d651a7b1863b531d6e5afa41aa44eac"
 
-tslint@^5.9.1:
+tslint@5.9.1:
   version "5.9.1"
   resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.9.1.tgz#1255f87a3ff57eb0b0e1f0e610a8b4748046c9ae"
   dependencies:
@@ -2863,7 +2873,7 @@ yallist@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
 
-yargs-parser@^8.1.0:
+yargs-parser@8.1.0, yargs-parser@^8.1.0:
   version "8.1.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-8.1.0.tgz#f1376a33b6629a5d063782944da732631e966950"
   dependencies: