1442900 - Importing embedded JavaScript modules yields NS_NOINTERFACE when loading built web extensions including bundled experiments

Status: RESOLVED INVALID

(WebExtensions :: Experiments, defect)

Description

[fwollsen]

Importing embedded JavaScript modules yields NS_NOINTERFACE when loading built web extensions including bundled experiments

[Steps to reproduce]:
1. Clone the embedded web extension experiments example at https://github.com/motin/webext-experiment-hello/tree/cu-import-to-embedded-jsm-broken-on-web-ext-build
2. Copy Services.jsm from tree to the extension directory and add a Cu.import to hello.js as per https://github.com/motin/webext-experiment-hello/commit/e4df445779307b9a200baeb200a6f4849b2c1b4d
3. Run the extension using `web-ext run --bc -f nightly` and observe the following expected output:

WebExtensions:resourceUrl to embedded Services.jsm:  moz-extension://3a9c6db1-c4b5-c344-9cb0-744db1008e7a/Services.jsm  hello.js:11
WebExtensions:./Services.jsm loaded:  Object { prefs: Getter, appinfo: Getter, dirsvc: Getter, crashmanager: Getter, mm: Getter, ppmm: Getter, io: Getter, appShell: Getter, cache: Getter, cache2: Getter, 38 more… }  hello.js:13
hello sez: "Hello, world!"

4. Go to about:debugging and remove the extension automatically installed by web-ext run
5. In another terminal session, build the extension using `web-ext build`
6. Load the recently built zip file into Nightly

[Expected result]:
- The browser log should display the expected output as per above

[Actual result]:
- The following error is reported in the browser log:

WebExtensions:resourceUrl to embedded Services.jsm:  moz-extension://5d265e10-db47-5e4a-9e14-057bd90bd769/Services.jsm  hello.js:11
[Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIXPCComponents_Utils.import]"  nsresult: "0x80004002 (NS_NOINTERFACE)"  location: "JS frame :: jar:file:///Users/motin/Dev/Projects/mozilla/shield-studies/based-on-webextension-experiments/webext-experiment-hello-embedded-cu-import/extension/web-ext-artifacts/webext-experiment-hello-embedded-cu-import-1.0.zip!/hello.js :: hello :: line 12"  data: no]  (unknown)
Error: An unexpected error occurred  undefined        

[Notes]:
The built extension zip has the following file tree when unzipped:
.
├── Services.jsm
├── background.js
├── hello.js
├── manifest.json
└── schema.json

The tree and file contents is identical to the contents of the "extensions" directory.

Comment 1

[Kris Maglione [:kmag]]

The module loader does not support moz-extension: URLs, and that isn't going to change.