Uncaught Error: not implemented in deno:cli/tsc/06_util.js

[mknj]

I try to convert a bigger library to deno and got a not implemented error inside deno. i shrinked the cause down to using 5 small files.

versions

deno 1.4.0
v8 8.7.75
typescript 4.0.2
Ubuntu 20.04.1 LTS

error message

Check file:///...../src/test.js
error: Uncaught Error: not implemented
    at notImplemented (deno:cli/tsc/06_util.js:48:11)
    at IncrementalCompileHost.fileExists (deno:cli/tsc/99_main_compiler.js:279:14)
    at Object.fileExists (deno:cli/tsc/00_typescript.js:103557:33)
    at tryDirectoryWithPackageJson (deno:cli/tsc/00_typescript.js:107929:26)
    at tryGetModuleNameAsNodeModule (deno:cli/tsc/00_typescript.js:107898:30)
    at deno:cli/tsc/00_typescript.js:107691:88
    at Object.mapDefined (deno:cli/tsc/00_typescript.js:804:30)
    at Object.getModuleSpecifiers (deno:cli/tsc/00_typescript.js:107691:29)
    at getSpecifierForModuleSymbol (deno:cli/tsc/00_typescript.js:47148:62)
    at serializeAsAlias (deno:cli/tsc/00_typescript.js:48271:60)

how to reproduce

(i am using patch to create the needed directories and files)

patch -p0 <<EOF
+++ src/a.js
@@ -0,0 +1,2 @@
+import { v4 } from "./d.ts";
+export function a(){};
+++ src/d.ts
@@ -0,0 +1 @@
+export function v4() { return "hello"; }
+++ src/node_modules/b.js
@@ -0,0 +1,2 @@
+import c from "./c.js";
+export { c };
+++ src/node_modules/c.js
@@ -0,0 +1 @@
+export default function c(){};
+++ src/test.js
@@ -0,0 +1,2 @@
+import { a } from "./a.js";
+import { c } from "./node_modules/b.js";
EOF

deno run src/test.js

[kitsonk]

Hrrrmmm... It seems that if there is a file that exists in node_modules, TypeScript still scans for things like package.json. We let that in there, as we didn't know of a scenario that it would actually be called, but it seems you found one. I suspect we can just silently ignore it and log it out to the debug in Deno in case we every find another strange behaviour.

Should be a straight forward fix, which I will work on.