fix: reintroduce source-map support

package.json

@@ -60,9 +60,10 @@
     "rxjs": "^6.5.4",
     "simple-git": "^2.0.0",
     "slash": "^3.0.0",
+    "source-map-support": "^0.5.19",
     "strip-ansi": "^6.0.0",
     "ts-morph": "^7.1.0",
-    "ts-node": "^8.10.1",
+    "ts-node": "^8.10.2",
     "tslib": "^2.0.0",
     "type-fest": "^0.16.0",
     "typescript": "3.9.x"
@@ -77,6 +78,7 @@
     "@types/lodash": "4.14.152",
     "@types/node": "13.13.9",
     "@types/parse-json": "^4.0.0",
+    "@types/source-map-support": "^0.5.2",
     "@types/which": "^1.3.2",
     "cross-env": "^7.0.2",
     "docsify": "4.11.3",

src/lib/tsc.ts

@@ -1,6 +1,9 @@
 import { Either, left, right } from 'fp-ts/lib/Either'
 import * as fs from 'fs-jetpack'
+import * as path from 'path'
 import { addHook } from 'pirates'
+import slash from 'slash'
+import * as sourceMapSupport from 'source-map-support'
 import * as ts from 'typescript'
 import { Layout } from './layout'
 import { rootLogger } from './nexus-logger'
@@ -141,20 +144,84 @@ function createTSError(diagnostics: ReadonlyArray<ts.Diagnostic>) {
  * This is strictly about transpilation, no type checking is done.
  */
 export function registerTypeScriptTranspile(compilerOptions?: ts.CompilerOptions) {
+  const outputCache = new Map<
+    string,
+    {
+      content: string
+    }
+  >()
+  const options = compilerOptions ?? {}
+  sourceMapSupport.install({
+    environment: 'node',
+    retrieveFile(path) {
+      return outputCache.get(slash(path))?.content || ''
+    },
+  })
+
+  /**
+   * Get the extension for a transpiled file.
+   */
+  const getExtension =
+    options.jsx === ts.JsxEmit.Preserve
+      ? (path: string) => (/\.[tj]sx$/.test(path) ? '.jsx' : '.js')
+      : (_: string) => '.js'
+
   addHook(
     (source, fileName) => {
       const transpiled = ts.transpileModule(source, {
         reportDiagnostics: true,
         fileName,
-        compilerOptions,
+        compilerOptions: {
+          ...options,
+          sourceMap: true,
+        },
       })
 
       if (transpiled.diagnostics && transpiled.diagnostics.length > 0) {
         throw createTSError(transpiled.diagnostics)
       }
 
+      const normalizedFileName = slash(fileName)
+      const output = updateOutput(
+        transpiled.outputText,
+        normalizedFileName,
+        transpiled.sourceMapText!,
+        getExtension
+      )
+      outputCache.set(normalizedFileName, { content: output })
+
       return transpiled.outputText
     },
     { exts: ['.ts'] }
   )
 }
+
+/**
+ * Update the output remapping the source map.
+ * Taken from ts-node
+ */
+function updateOutput(
+  outputText: string,
+  fileName: string,
+  sourceMap: string,
+  getExtension: (fileName: string) => string
+) {
+  const base64Map = Buffer.from(updateSourceMap(sourceMap, fileName), 'utf8').toString('base64')
+  const sourceMapContent = `data:application/json;charset=utf-8;base64,${base64Map}`
+  const sourceMapLength =
+    `${path.basename(fileName)}.map`.length + (getExtension(fileName).length - path.extname(fileName).length)
+
+  return outputText.slice(0, -sourceMapLength) + sourceMapContent
+}
+
+/**
+ * Update the source map contents for improved output.
+ * Taken from ts-node
+ */
+function updateSourceMap(sourceMapText: string, fileName: string) {
+  const sourceMap = JSON.parse(sourceMapText)
+  sourceMap.file = fileName
+  sourceMap.sources = [fileName]
+  delete sourceMap.sourceRoot
+  return JSON.stringify(sourceMap)
+}

yarn.lock

@@ -1005,6 +1005,14 @@
     "@types/express-serve-static-core" "*"
     "@types/mime" "*"
 
+"@types/source-map-support@^0.5.2":
+  version "0.5.2"
+  resolved "https://registry.yarnpkg.com/@types/source-map-support/-/source-map-support-0.5.2.tgz#35e7446d470e63ec3fff4d7eceee0bc40efad239"
+  integrity sha512-krvWmwQ2Pzr+Yp8tKjhKC9UguRNg1ev9mNdlVVpVJvU9iynulYZsx3ydf1SPzNNxzhmbWAOAIw5hMWhAMDc2NA==
+  dependencies:
+    "@types/node" "*"
+    source-map "^0.6.0"
+
 "@types/stack-utils@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"
@@ -5776,7 +5784,7 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
-source-map-support@^0.5.17:
+source-map-support@^0.5.17, source-map-support@^0.5.19:
   version "0.5.19"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
   integrity sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==
@@ -6229,10 +6237,10 @@ ts-morph@^7.1.0:
     "@ts-morph/common" "~0.5.0"
     code-block-writer "^10.1.0"
 
-ts-node@^8.10.1:
-  version "8.10.1"
-  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-8.10.1.tgz#77da0366ff8afbe733596361d2df9a60fc9c9bd3"
-  integrity sha512-bdNz1L4ekHiJul6SHtZWs1ujEKERJnHs4HxN7rjTyyVOFf3HaJ6sLqe6aPG62XTzAB/63pKRh5jTSWL0D7bsvw==
+ts-node@^8.10.2:
+  version "8.10.2"
+  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-8.10.2.tgz#eee03764633b1234ddd37f8db9ec10b75ec7fb8d"
+  integrity sha512-ISJJGgkIpDdBhWVu3jufsWpK3Rzo7bdiIXJjQc0ynKxVOVcg2oIrf2H2cejminGrptVc6q6/uynAHNCuWGbpVA==
   dependencies:
     arg "^4.1.0"
     diff "^4.0.1"