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Make "weak" optional dependency and check it at runtime #4984

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merged 2 commits into from
Nov 29, 2017
Merged

Make "weak" optional dependency and check it at runtime #4984

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715bfce
Make "weak" optional dependency and check it at runtime
Nov 29, 2017
c92a513
Update index.js
cpojer Nov 29, 2017
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4 changes: 3 additions & 1 deletion packages/jest-leak-detector/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,9 @@
"license": "MIT",
"main": "build/index.js",
"dependencies": {
"pretty-format": "^21.2.1",
"pretty-format": "^21.2.1"
},
"optionalDependencies": {
"weak": "^1.0.1"
}
}
12 changes: 11 additions & 1 deletion packages/jest-leak-detector/src/index.js
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Expand Up @@ -12,7 +12,6 @@
import prettyFormat from 'pretty-format';
import v8 from 'v8';
import vm from 'vm';
import weak from 'weak';

const PRIMITIVE_TYPES = new Set([
'undefined',
Expand All @@ -35,6 +34,17 @@ export default class {
);
}

let weak;

try {
weak = require('weak');
} catch (err) {
throw new Error(
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This hides all sorts of errors. can we do an explicit check for MODULE_NOT_FOUND, and if not, rethrow original error?

(can use https://www.npmjs.com/package/optional and rethrow, but rolling our own should not be an issue)

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for convenience, optional would be something like

const weak = optional('weak', { rethrow: true });

if (!weak) {
  throw new Error(
    'The leaking detection mechanism requires the "weak" package to work. ' +
      'Please make sure that you can install the native dependency on your platform.',
  );
}

current usage is just an if away, so might not be worth the extra dep 🙂

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I like the stricter check, let me add that into a new PR but as our own custom check; checking error.code should not require a new dependency 🙂

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Fixed in #5010.

'The leaking detection mechanism requires the "weak" package to work. ' +
'Please make sure that you can install the native dependency on your platform.',
);
}

weak(value, () => (this._isReferenceBeingHeld = false));
this._isReferenceBeingHeld = true;

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