Initial typescript setup

.eslintrc.json

@@ -1,4 +1,5 @@
 {
+  "parser": "@typescript-eslint/parser",
   "parserOptions": {
       "ecmaVersion": 6,
       "sourceType": "module",
@@ -7,6 +8,8 @@
       }
   },
   "rules": {
+      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
       "indent": ["error", 2, { "SwitchCase": 1 }],
       "linebreak-style": ["error", "unix"],
       "no-console": ["warn", { "allow": ["warn", "error"] }],
@@ -15,10 +18,16 @@
       "quotes": ["error", "single", { "allowTemplateLiterals": true, "avoidEscape": true }],
       "semi": ["error", "always"]
   },
+  "overrides": [{
+    "files": ["test/**/*.{js,ts}", "examples/**/*.js", "bin/**/*.js"],
+    "rules": {
+      "@typescript-eslint/no-var-requires": "off"
+    }
+  }],
   "env": {
       "es6": true,
       "node": true,
       "mocha": true
   },
-  "extends": ["eslint:recommended", "prettier"]
-}
+  "extends": ["plugin:@typescript-eslint/recommended", "prettier"]
+}

.github/pull_request_template.md

@@ -11,9 +11,9 @@ It is strongly recommended to include a person from each of those projects as a
 - [ ] Tests are included and test edge cases
 - [ ] Tests have been run locally and pass
 - [ ] Code coverage has not gone down and all code touched or added is covered.
-- [ ] Code passes lint and prettier (hint: use `yarn run test:plus` to run tests, lint, and prettier)
+- [ ] Code passes lint and prettier (hint: use `npm run test:plus` to run tests, lint, and prettier)
 - [ ] All dependent libraries are appropriately updated or have a corresponding PR related to this change
-- [ ] `cql4browsers.js` built with `yarn run build:browserify` if source changed.
+- [ ] `cql4browsers.js` built with `npm run build:browserify` if source changed.
 
 **Reviewer:**
 

.github/workflows/ci-workflow.yml

@@ -4,14 +4,14 @@ on: [push, pull_request]
 
 jobs:
   audit:
-    name: Check yarn audit
+    name: Check npm audit
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
         node-version: '12.x'
-    - run: yarn audit
+    - run: npm audit
       env:
         CI: true
   cql4browsers:
@@ -33,9 +33,9 @@ jobs:
     - uses: actions/setup-node@v1
       with:
         node-version: '12.x'
-    - run: yarn install
-    - run: yarn run lint
-    - run: yarn run prettier
+    - run: npm install
+    - run: npm run lint
+    - run: npm run prettier
       env:
         CI: true
   test:
@@ -51,8 +51,8 @@ jobs:
       with:
         timezone: America/New_York
     - run: date +"%Y-%m-%d %T"
-    - run: yarn install
+    - run: npm install
     - run: ./bin/check_for_nonassertive_tests.sh
-    - run: npx nyc --reporter=lcov yarn test && npx codecov
+    - run: npx nyc --reporter=lcov npm test && npx codecov
       env:
         CI: true

.mocharc.json

@@ -0,0 +1,4 @@
+{
+  "extension": ["ts"],
+  "require": "ts-node/register"
+}

README.md

@@ -59,9 +59,8 @@ The above is a partial list covering the most significant limitations. For more
 
 To use this project, you should perform the following steps:
 
-1. Install [Node.js](http://nodejs.org/)
-2. Install [Yarn](https://yarnpkg.com)
-3. Execute the following from the root directory: `yarn install`
+1. Install [Node.js](http://nodejs.org/) (Note: `npm` version `6.x.x` recommended)
+2. Execute the following from the root directory: `npm install`
 
 # To Execute Your CQL
 
@@ -149,7 +148,7 @@ If all is well, it should print the result object to standard out.
 
 # To Run the CQL Execution Unit Tests
 
-Execute `yarn test`.
+Execute `npm test`.
 
 # To Develop Tests
 
@@ -167,7 +166,7 @@ statements that follows the `# And` represents the CQL Library that will be supp
 to the "And" test suite.
 
 To convert the CQL to JavaScript containing the JSON ELM representation, execute
-`yarn build:test-data`. This will use the java _cql-to-elm_ project to generate the
+`npm run build:test-data`. This will use the java _cql-to-elm_ project to generate the
 _test/elm/*/data.js_ file containing the following exported variable declaration
 (NOTE: It's been slimmed down a bit here to make it easier to read, but nothing substantial
 has been removed):
@@ -275,16 +274,16 @@ use lowercase first letters even though the CQL expression name starts with an u
 
 # Watching For Changes
 
-Rather than continually having to run `yarn build:test-data` and `yarn:test` after every
+Rather than continually having to run `npm run build:test-data` and `npm test` after every
 modification to the test data text file, you can setup a process to _watch_ for changes and
 regenerate the `data.js` files every time it detects changes in the source text file.  Simply
-execute `yarn watch:test-data`.
+execute `npm run watch:test-data`.
 
 # Pull Requests
 
 If JavaScript source code is modified, `cql4browsers.js` needs to be included in the pull request,
 otherwise Travis CI will fail. To generate this file, run:
 
 ```
-yarn build:all
+npm run build:all
 ```

bin/validate_cql4browsers.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 mkdir -p tmp/dist/
-git status --porcelain | grep cql4browsers
+git status --porcelain | grep cql4browsers.js
 if [ $? == 0 ]; then
   echo "cql4browsers.js has uncommitted changes. Reset or commit them before continuing."
   exit 1
@@ -13,7 +13,7 @@ if [ $? != 0 ]; then
   echo "cql4browsers.js not found. Run this script from the base repository directory."
   exit 1
 fi
-yarn install
+npm install
 
 # comm -3 only returns lines that differ between the two files. If none are different, diff will be empty
 diff=`diff ./examples/browser/cql4browsers.js.original ./examples/browser/cql4browsers.js`
@@ -22,7 +22,7 @@ mv ./examples/browser/cql4browsers.js.original ./examples/browser/cql4browsers.j
 
 # Exit with a non-zero code if the diff isn't empty
 if [ "$diff" != "" ]; then
-  echo "cql4browsers.js is out of date. Please run 'yarn install' locally and commit/push the result"
+  echo "cql4browsers.js is out of date. Please run 'npm install' locally and commit/push the result"
   exit 1
 fi
 

examples/browser/README.md

@@ -5,8 +5,7 @@ does not support other data models or execution on patients.
 The browserified code is checked into source control, but if you need to update it,
 you can follow these steps:
 
-1. Install [Node.js](http://nodejs.org/)
-2. Install [Yarn](https://yarnpkg.com)
-3. Execute the following from the _cql-execution_ directory:
-   1. `yarn install`
-   2. `cake build:all`
+1. Install [Node.js](http://nodejs.org/) (Note: `npm` version `6.x.x` recommended)
+2. Execute the following from the _cql-execution_ directory:
+   1. `npm install`
+   2. `npm run build:all`