Node 18: You must provide the URL of lib/mappings.wasm by calling `SourceMapConsumer.initialize`

[mikaello]

Expected behavior:

No errors when using Node 18 or higher. Bug in source-map dependency (fixed in latest version): mozilla/source-map#454

Actual behavior:

Getting the following:

[14:06:45] Error: You must provide the URL of lib/mappings.wasm by calling SourceMapConsumer.initialize({ 'lib/mappings.wasm': ... }) before using SourceMapConsumer
    at readWasm (/workspaces/my-project/example/node_modules/source-map/lib/read-wasm.js:8:13)
    at wasm (/workspaces/my-project/example/node_modules/source-map/lib/wasm.js:25:16)
    at /workspaces/my-project/example/node_modules/source-map/lib/source-map-consumer.js:264:14
    at processTicksAndRejections (node:internal/process/task_queues:95:5)

Your gulpfile:

Include your gulpfile, or only the related task (with ts.createProject).

import ts from "gulp-typescript";

const tsProjectLib = ts.createProject("../tsconfig.json", {
  rootDir: "../",
});
const LIB_SOURCE = "../src/**/*.ts";

const transpileLibTypescript = () =>
  src(LIB_SOURCE).pipe(tsProjectLib()).pipe(dest("../dist"));

task("default", () => {
  watch(LIB_SOURCE, transpileLibTypescript);
});

Workarounds

Set this environment variable: export NODE_OPTIONS=--no-experimental-fetch

OR

Upgrade source-map for gulp-typescript, here is the Yarn config (use overrides for NPM):

  "resolutions": {
    "gulp-typescript/source-map": "0.7.4"
  },

Click for NPM config

  "overrides": {
    "gulp-typescript": {
      "source-map": "0.7.4"
    }
  }