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fix(deadcode): account for impure paths inside for statements #834

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merged 2 commits into from
May 10, 2018
Merged

fix(deadcode): account for impure paths inside for statements #834

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d0f5ffa
fix(deadcode): account for impure paths inside for statements
vigneshshanmugam May 8, 2018
f6b1a9a
add env test
vigneshshanmugam May 8, 2018
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4 changes: 4 additions & 0 deletions packages/babel-plugin-minify-dead-code-elimination/__tests__/fixtures/loops/actual.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,10 @@ for (; true; ) {
for (; false; ) {
baz();
}
for (var j; false; ) {
blah();
}
for (0; false; ) {}

// do_while
do {
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2 changes: 2 additions & 0 deletions packages/babel-plugin-minify-dead-code-elimination/__tests__/fixtures/loops/expected.js
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Expand Up @@ -16,6 +16,8 @@ for (;;) {
bar();
}

var j;

// do_while
do {
foo();
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7 changes: 6 additions & 1 deletion packages/babel-plugin-minify-dead-code-elimination/src/index.js
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Expand Up @@ -678,7 +678,12 @@ module.exports = ({ types: t, traverse }) => {
if (result.value) {
test.remove();
} else {
path.remove();
const init = path.get("init");
if (init.node && !init.isPure()) {
path.replaceWith(init);
} else {
path.remove();
}
}
}
},
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13 changes: 13 additions & 0 deletions packages/babel-preset-minify/__tests__/minify-env-tests.js
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Expand Up @@ -183,4 +183,17 @@ describe("preset along with env", () => {
})();
`
);

thePlugin(
"should fix issue#824 simplify + deadcode",
`
let foo;
while (0) {}
console.log(foo);
`,
`
var foo;
console.log(foo);
`
);
});