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Do not transform -0

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Reviewed By: rubennorte

Differential Revision: D8095511

fbshipit-source-id: 8f75cdf04cce58691b59b2c9dcac620150706ab3
This commit is contained in:
Miguel Jimenez Esun 2018-05-22 08:12:17 -07:00 committed by Facebook Github Bot
parent adce40d38d
commit f0a0e92f5f
2 changed files with 15 additions and 1 deletions
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12
packages/metro/src/JSTransformer/worker/__tests__/constant-folding-plugin-test.js
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@ -259,4 +259,16 @@ describe('constant expressions', () => {
expect(fold('arbitrary.js', code)).toEqual('var x=2;{z();}'); expect(fold('arbitrary.js', code)).toEqual('var x=2;{z();}');
}); });
it('does not mess up -0', () => {
const code = `
var plusZero = +0;
var zero = 0;
var minusZero = -0;
`;
expect(fold('arbitrary.js', code)).toEqual(
'var plusZero=0;var zero=0;var minusZero=-0;',
);
});
}); });

2
packages/metro/src/JSTransformer/worker/constant-folding-plugin.js
View File

@ -63,8 +63,10 @@ function constantFoldingPlugin(context: {types: BabelTypes}) {
const result = path.evaluate(); const result = path.evaluate();
if (result.confident) { if (result.confident) {
if (!Object.is(result.value, -0)) {
path.replaceWith(t.valueToNode(result.value)); path.replaceWith(t.valueToNode(result.value));
} }
}
}, },
}; };