Go to Definition does not work for mjs files

[joshunger]

Issue Type: Bug

Go to Definition (⌘+Click) does not work for mjs files.

VS Code version: Code - Insiders 1.29.0-insider (4b2fac2b6da220f62ff58b2766e4ecc1f561be94, 2018-10-30T16:46:24.907Z)
OS version: Darwin x64 18.0.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-7267U CPU @ 3.10GHz (4 x 3100)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	16.00GB (0.23GB free)
Process Argv	.
Screen Reader	no
VM	0%

Extensions (16)

Extension	Author (truncated)	Version
vscode-eslint	dba	1.6.1
xml	Dot	2.3.2
gitlens	eam	8.5.6
EditorConfig	Edi	0.12.5
prettier-vscode	esb	1.6.1
flow-for-vscode	flo	0.8.4
python	ms-	2018.9.2
vscode-docker	Pet	0.3.1
java	red	0.33.0
vscode-fileutils	sle	2.11.0
code-spell-checker	str	1.6.10
sort-lines	Tyr	1.7.0
vscode-java-debug	vsc	0.14.0
vscode-java-pack	vsc	0.4.0
vscode-java-test	vsc	0.10.0
vscode-maven	vsc	0.11.1

[mjbvz]

Likely falls under #18442 but someone on the TS team will have to verify

[weswigham]

Duplicates #27957. We don't read .mjs files right now.

[robertrossmann]

I crafted a patch which enables tsserver to recognise, parse and provide type hints for .mjs files.

This might be useful for people who use the .mjs file extensions for JavaScript files with identical module resolution semantics as CommonJS. Note that this patch does not implement any special behaviour with regard to ES modules and might not be spec-compliant. However, editor integrations which allow using custom-built tsserver implementations will greatly increase developer productivity because suddenly everything seems to work.

[typescript-bot]

This issue has been marked as a duplicate and has seen no activity in the last day. It has been closed for automatic house-keeping purposes.