Error during eval. Possible bad escaping of module? about ember-auto-import HOT 9 CLOSED

The root cause is in source-map-url, which is a dep of fast-sourcemap-concat. I did a patch release of fast-sourcemap-concat that downgrades source-map-url, and it fixes this bug.

Allow your version of fast-sourcemap-concat to update to 1.3.2 and this problem should go away.

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I just also ran into this issue. Weirdly, everything was working fine, until suddenly it didn't anymore, after updating dependencies. I tried downgrading ember-auto-import to 1.0.1 but the issue persisted.

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Same. I had this working but now it fails. I tried downgrading luxon and ember-auto-import but it keeps failing. I'm almost sure that it's failing because of an update in webpack.
(use Ember they said, you won't have to worry about webpack they said...)

After further digging I discovered that the syntax error is in the very end of the eval'ed string, in the webpack comment:

exports.FixedOffsetZone = FixedOffsetZone;
exports.IANAZone = IANAZone;
exports.LocalZone = LocalZone;
exports.Settings = Settings;
sourceURL=webpack://__ember_auto_import__/./node_modules/luxon/build/cjs-browser/luxon.js?

Seems that the last line should be a comment but it's not.

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I think this is a bug in broccoli-concat. Here's the very end of the module's definition before and after concat:

exports.Settings = Settings;\n//# sourceMappingURL=luxon.js.map\n\n\n//# sourceURL=webpack://__ember_auto_import__/./node_modules/luxon/build/cjs-browser/luxon.js?");
exports.Settings = Settings;\nsourceURL=webpack://__ember_auto_import__/./node_modules/luxon/build/cjs-browser/luxon.js?");

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@cibernox's repro app stops being broken if you disable sourcemaps:

diff --git a/ember-cli-build.js b/ember-cli-build.js
index dc5a39e..89729fe 100644
--- a/ember-cli-build.js
+++ b/ember-cli-build.js
@@ -5,6 +5,9 @@ const EmberAddon = require('ember-cli/lib/broccoli/ember-addon');
 module.exports = function(defaults) {
   let app = new EmberAddon(defaults, {
     // Add options here
+    sourcemaps: {
+      enabled: false
+    }
   });

   /*

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Maybe it's the concatenation of sourcemaps?

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I'm pretty confident this is a bug in the sourcemap-aware concatenation in either broccoli-concat or fast-sourcemap-concat. If somebody can reduce this failure to a test case there it would help.

For now, the best workaround is disabling sourcemaps in your app.

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Was able to narrow down the dependency causing the issue to fast-sourcemap-concat 1.3.1 release.
Opened an issue there: ef4/fast-sourcemap-concat#53

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