feat: add project param and load TSC from project

- project param can be used to specify location of the tsc project
- will use locally installed typescript module and then fallback to CDN

Author: Gozala

README.md

@@ -49,3 +49,16 @@ jobs:
   "include": ["src/**/*.ts"]
 }
 ```
+
+## Passing `project` parameter
+
+If your working with a monorepo or your `tsconfig.json` is not in the root repo,
+or you use different config file, you can provide a `project` parmeter with a
+path to the repo itself:
+
+```yaml
+- name: Typecheck
+  uses: andoshin11/[email protected]
+  with:
+    project: packages/subpackage/tsconfig.json
+```

action.yml

@@ -7,3 +7,7 @@ runs:
 branding:
   icon: 'check-circle'
   color: 'blue'
+inputs:
+  project:
+    description: 'Optional project path.'
+    required: false

dist/index.js

@@ -1,70 +1,23 @@
 import * as path from 'path'
 import * as fs from 'fs'
 import { DiagnosticCategory } from 'typescript'
-import { setFailed } from '@actions/core'
-import * as YarnLockFile from '@yarnpkg/lockfile'
+import { getInput, setFailed } from '@actions/core'
 import { Doctor } from './doctor'
 import { loadTSModule } from './loadTSModule'
 
-function parseTSVersion(currentDir: string) {
-  const yarnLockFilePath = path.resolve(currentDir, 'yarn.lock')
-  const packageLockFile = path.resolve(currentDir, 'package-lock.json')
-  if (fs.existsSync(yarnLockFilePath)) {
-    const content = fs.readFileSync(yarnLockFilePath, 'utf8')
-    return parseTSVersionFromYarnLockFile(content)
-  } else if (fs.existsSync(packageLockFile)) {
-    const content = fs.readFileSync(packageLockFile, 'utf8')
-    return parseTSVersionFromPackageLockFile(content)
-  } else {
-    throw new Error('no lock file found.')
-  }
-}
-
-function parseTSVersionFromYarnLockFile(content: string) {
-  const { type, object } = YarnLockFile.parse(content)
-  if (type !== 'success') {
-    throw new Error('failed to parse yarn.lock')
-  }
-  const packages = Object.keys(object)
-  const _typescript = packages.find(p => /^typescript@.*/.test(p))
-  if (!_typescript) {
-    throw new Error('could not find typescript in yarn.lock')
-  }
-  const _typescriptInfo = object[_typescript]
-  const tsVersion = _typescriptInfo && _typescriptInfo['version']
-  if (typeof tsVersion !== 'string') {
-    throw new Error('could not par typescript version from yarn.lock')
-  }
-  return tsVersion
-}
-
-function parseTSVersionFromPackageLockFile(content: string) {
-  const json = JSON.parse(content)
-  const dependencies = json['dependencies'] || {}
-  const _typescriptInfo = dependencies['typescript']
-  if (!_typescriptInfo) {
-    throw new Error('could not find typescript in package-lock.json')
-  }
-  const tsVersion = _typescriptInfo['version']
-  if (typeof tsVersion !== 'string') {
-    throw new Error('could not par typescript version from yarn.lock')
-  }
-  return tsVersion
-}
 
 async function main() {
   try {
-
-    const currentDir = process.cwd()
-    const configPath = path.resolve(currentDir, 'tsconfig.json')
-    if (!fs.existsSync(configPath)) {
-      throw new Error(`could not find tsconfig.json at: ${currentDir}`)
+    const project = getInput('project') || 'tsconfig.json'
+    const tscPath = getInput('tsc')
+    const projectPath = path.resolve(process.cwd(), project)
+    if (!fs.existsSync(projectPath)) {
+      throw new Error(`No such TS config file: ${projectPath}`)
     }
 
-    const tsVersion = parseTSVersion(currentDir)
-    const remoteTS = await loadTSModule(tsVersion)
+    const ts = await loadTSModule(projectPath)
 
-    const doctor = Doctor.fromConfigFile(configPath, remoteTS)
+    const doctor = Doctor.fromConfigFile(projectPath, ts)
     const diagnostics = doctor.getSemanticDiagnostics()
 
     if (diagnostics) {

src/index.ts

@@ -67,7 +67,7 @@ export const createHost = (fileNames: string[], compilerOptions: _ts.CompilerOpt
     },
     getCurrentDirectory: () => process.cwd(),
     getCompilationSettings: () => compilerOptions,
-    getDefaultLibFileName: options => ts.getDefaultLibFilePath(options),
+    getDefaultLibFileName: options => ts.getDefaultLibFileName(options),
     resolveModuleNames: (moduleNames, containingFile, _, __, options) => {
       const ret: (_ts.ResolvedModule | undefined)[] = moduleNames.map(name => {
           if (/\.vue$/.test(name)) {

src/langSvc/createHost.ts

@@ -1,22 +1,47 @@
 import * as https from 'https'
+import Module from 'module'
 const concat = require('concat-stream')
+import * as YarnLockFile from '@yarnpkg/lockfile'
+import * as path from 'path'
+import * as fs from 'fs'
 
 type TSModule = typeof import('typescript')
 
-export const loadTSModule = async (version: string) => {
-  let localTS: TSModule
 
-  try {
-    const CDNPath = `https://cdnjs.cloudflare.com/ajax/libs/typescript/${version}/typescript.min.js`
-    const remoteScript = await fetchScript(CDNPath)
-    localTS = _eval(remoteScript)
-    console.log(`Loaded typescript@${localTS.version} from CDN.`);
-  } catch (e) {
-    localTS = require('typescript');
-    console.log(`Failed to load typescript from CDN. Using bundled typescript@${localTS.version}.`);
-  }
+export const loadTSModule = async (projectPath:string) => {
+  let ts: TSModule = await loadLocalTSModule(projectPath).catch(_ => null)
+    || await loadRemoteTSModule(projectPath).catch(_ => null)
+    || loadBundledTSModule()
+  
+  return ts
+}
+
+
+/**
+ * Attempts to load typescript for the given project path by loading `typescript`
+ * from with-in it. If fails (e.g. no such module is installed) returns null.
+ */
+
+const loadLocalTSModule = async (projectPath: string) => {
+  const require = Module.createRequire(projectPath)
+  const ts = require('typescript')
+  console.log(`Using local typescript@${ts.version}`);
+  return ts
+}
+
+const loadBundledTSModule = () => {
+  const ts = require('typescript')
+  console.log(`Failed to find project specific typescript, falling back to bundled typescript@${ts.version}`);
+  return ts
+}
 
-  return localTS
+const loadRemoteTSModule = async(projectPath:string) => {
+  const version = parseTSVersion(projectPath)
+  const CDNPath = `https://cdnjs.cloudflare.com/ajax/libs/typescript/${version}/typescript.min.js`
+  const remoteScript = await fetchScript(CDNPath)
+  const ts = _eval(remoteScript)
+  console.log(`Loaded typescript@${ts.version} from CDN.`);
+  return ts
 }
 
 async function fetchScript(url: string) {
@@ -60,3 +85,49 @@ function _eval(script: string): any {
 
 	return module.exports;
 }
+
+function parseTSVersion(projectPath: string) {
+  const yarnLockFilePath = path.resolve(projectPath, './yarn.lock')
+  const packageLockFile = path.resolve(projectPath, './package-lock.json')
+  if (fs.existsSync(yarnLockFilePath)) {
+    const content = fs.readFileSync(yarnLockFilePath, 'utf8')
+    return parseTSVersionFromYarnLockFile(content)
+  } else if (fs.existsSync(packageLockFile)) {
+    const content = fs.readFileSync(packageLockFile, 'utf8')
+    return parseTSVersionFromPackageLockFile(content)
+  } else {
+    throw new Error('no lock file found.')
+  }
+}
+
+function parseTSVersionFromYarnLockFile(content: string) {
+  const { type, object } = YarnLockFile.parse(content)
+  if (type !== 'success') {
+    throw new Error('failed to parse yarn.lock')
+  }
+  const packages = Object.keys(object)
+  const _typescript = packages.find(p => /^typescript@.*/.test(p))
+  if (!_typescript) {
+    throw new Error('could not find typescript in yarn.lock')
+  }
+  const _typescriptInfo = object[_typescript]
+  const tsVersion = _typescriptInfo && _typescriptInfo['version']
+  if (typeof tsVersion !== 'string') {
+    throw new Error('could not par typescript version from yarn.lock')
+  }
+  return tsVersion
+}
+
+function parseTSVersionFromPackageLockFile(content: string) {
+  const json = JSON.parse(content)
+  const dependencies = json['dependencies'] || {}
+  const _typescriptInfo = dependencies['typescript']
+  if (!_typescriptInfo) {
+    throw new Error('could not find typescript in package-lock.json')
+  }
+  const tsVersion = _typescriptInfo['version']
+  if (typeof tsVersion !== 'string') {
+    throw new Error('could not par typescript version from yarn.lock')
+  }
+  return tsVersion
+}