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safer properties transform (#2391)

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`{ a: x, b: y }.a` => `[ x, y ][0]`
- `x` cannot be function containing `this`

`[ x, y, z ][1]` => `(x, z, y)`
- only if `z` is side-effect-free
This commit is contained in:
Alex Lam S.L
2017-10-22 20:10:13 +08:00
committed by GitHub
parent 5fd723f143
commit 24aa07855b
6 changed files with 226 additions and 120 deletions
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67
test/compress/collapse_vars.js
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@@ -2534,73 +2534,6 @@ issue_2319_3: {
expect_stdout: "true"
}
prop_side_effects_1: {
options = {
collapse_vars: true,
evaluate: true,
pure_getters: "strict",
reduce_vars: true,
toplevel: true,
unsafe: true,
unused: true,
}
input: {
var C = 1;
console.log(C);
var obj = {
bar: function() {
return C + C;
}
};
console.log(obj.bar());
}
expect: {
console.log(1);
console.log({
bar: function() {
return 2;
}
}.bar());
}
expect_stdout: [
"1",
"2",
]
}
prop_side_effects_2: {
options = {
collapse_vars: true,
evaluate: true,
inline: true,
passes: 2,
pure_getters: "strict",
reduce_vars: true,
side_effects: true,
toplevel: true,
unsafe: true,
unused: true,
}
input: {
var C = 1;
console.log(C);
var obj = {
bar: function() {
return C + C;
}
};
console.log(obj.bar());
}
expect: {
console.log(1);
console.log(2);
}
expect_stdout: [
"1",
"2",
]
}
issue_2365: {
options = {
collapse_vars: true,