fix(node): #1180 - Enable ESM support

CHANGELOG.md

@@ -15,7 +15,7 @@
 ## Main
 
 <!-- Your comment below this -->
-
+- [#1180] Fix for MTS danger files [@matthewh]
 <!-- Your comment above this -->
 
 ## 12.3.1

package.json

@@ -140,7 +140,7 @@
     "ts-jest": "^28.0.0",
     "ts-node": "^10.9.2",
     "typedoc": "0.9.0",
-    "typescript": "^4.5.5",
+    "typescript": "^4.9.5",
     "typescript-json-schema": "^0.53.0"
   },
   "dependencies": {

source/commands/utils/fileUtils.ts

@@ -12,6 +12,15 @@ export function dangerfilePath(program: any): string {
     return program.dangerfile
   }
 
+
+  if (existsSync("dangerfile.mts")) {
+    return "dangerfile.mts"
+  }
+
+  if (existsSync("dangerfile.mjs")) {
+    return "dangerfile.mjs"
+  }
+
   if (existsSync("dangerfile.ts")) {
     return "dangerfile.ts"
   }
@@ -20,6 +29,14 @@ export function dangerfilePath(program: any): string {
     return "dangerfile.js"
   }
 
+  if (existsSync("Dangerfile.mts")) {
+    return "Dangerfile.mts"
+  }
+
+  if (existsSync("Dangerfile.mjs")) {
+    return "Dangerfile.mjs"
+  }
+
   if (existsSync("Dangerfile.ts")) {
     return "Dangerfile.ts"
   }

source/runner/runners/inline.ts

@@ -1,5 +1,5 @@
 import * as fs from "fs"
-
+import * as path from "path"
 import { debug } from "../../debug"
 import _require from "require-from-string"
 
@@ -75,7 +75,7 @@ export const runDangerfileEnvironment = async (
 
   const customRequire = moduleHandler || customModuleHandler
 
-  // Tell all these filetypes to ge the custom compilation
+  // Tell all these filetypes to get the custom compilation
   require.extensions[".ts"] = customRequire
   require.extensions[".tsx"] = customRequire
   require.extensions[".js"] = customRequire
@@ -105,7 +105,18 @@ export const runDangerfileEnvironment = async (
       }
 
       d("Started parsing Dangerfile: ", filename)
-      const optionalExport = _require(compiled, filename, {})
+      let optionalExport
+      if (filename.endsWith(".mts")) {
+        const tmpFileName = path.join(process.cwd(), `._dangerfile.mjs`)
+        fs.writeFileSync(tmpFileName, compiled)
+        // tried but data urls have trouble with imports and I don't know how to fix
+        // optionalExport = (await import(`data:text/javascript;base64,${btoa(compiled)}`));
+        optionalExport = await import(tmpFileName)
+      } else if (filename.endsWith(".mjs")) {
+        optionalExport = await import(path.join(process.cwd(), filename))
+      } else {
+        optionalExport = _require(compiled, filename, {})
+      }
 
       if (typeof optionalExport.default === "function") {
         d("Running default export from Dangerfile", filename)

source/runner/runners/utils/transpiler.ts

@@ -119,7 +119,7 @@ export const lookupTSConfig = (dir: string): string | null => {
   return null
 }
 
-export const typescriptify = (content: string, dir: string): string => {
+export const typescriptify = (content: string, dir: string, esm: boolean = false): string => {
   const ts = require("typescript")
 
   // Support custom TSC options, but also fallback to defaults
@@ -131,11 +131,11 @@ export const typescriptify = (content: string, dir: string): string => {
     compilerOptions = ts.getDefaultCompilerOptions()
   }
 
-  let result = ts.transpileModule(content, sanitizeTSConfig(compilerOptions))
+  let result = ts.transpileModule(content, sanitizeTSConfig(compilerOptions, esm))
   return result.outputText
 }
 
-const sanitizeTSConfig = (config: any) => {
+const sanitizeTSConfig = (config: any, esm: boolean = false) => {
   if (!config.compilerOptions) {
     return config
   }
@@ -149,8 +149,10 @@ const sanitizeTSConfig = (config: any) => {
   //
   // @see https://github.com/apollographql/react-apollo/pull/1402#issuecomment-351810274
   //
-  if (safeConfig.compilerOptions.module) {
+  if (!esm && safeConfig.compilerOptions.module) {
     safeConfig.compilerOptions.module = "commonjs"
+  } else {
+    safeConfig.compilerOptions.module = "es6"
   }
 
   return safeConfig
@@ -202,9 +204,9 @@ export default (code: string, filename: string, remoteFile: boolean = false) =>
   }
 
   let result = code
-  if (hasNativeTypeScript && filetype.startsWith(".ts")) {
+  if (hasNativeTypeScript && (filetype.startsWith(".ts") || filetype.startsWith(".mts"))) {
     d("compiling with typescript")
-    result = typescriptify(code, path.dirname(filename))
+    result = typescriptify(code, path.dirname(filename), filename.endsWith(".mts"))
   } else if (hasBabel && hasBabelTypeScript && filetype.startsWith(".ts")) {
     d("compiling as typescript with babel")
     result = babelify(code, filename, [`${babelPackagePrefix}plugin-transform-typescript`])

tsconfig.json

@@ -13,7 +13,7 @@
     "noUnusedParameters": true,
     "esModuleInterop": true,
     "module": "commonjs",
-    "moduleResolution": "node",
+    "moduleResolution": "node16",
     "pretty": true,
     "target": "es5",
     "outDir": "distribution",