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minor clean-up for IIFE (#2582)

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- faster exact type match
- aggressively convert to `!`
This commit is contained in:
Alex Lam S.L
2017-12-13 01:27:26 +08:00
committed by GitHub
parent ddf96cfda2
commit e008dc1bde
1 changed files with 5 additions and 12 deletions
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15
lib/compress.js
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@@ -808,11 +808,9 @@ merge(Compressor.prototype, {
};
function is_iife_call(node) {
if (node instanceof AST_Call && !(node instanceof AST_New)) {
if (node.TYPE != "Call") return false;
return node.expression instanceof AST_Function || is_iife_call(node.expression);
}
return false;
}
function is_undeclared_ref(node) {
return node instanceof AST_SymbolRef && node.definition().undeclared;
@@ -3099,14 +3097,9 @@ merge(Compressor.prototype, {
}
if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef) return null;
var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
if (first_in_statement
&& this instanceof AST_UnaryPrefix
&& is_iife_call(expression)) {
if (expression === this.expression && this.operator.length === 1) return this;
return make_node(AST_UnaryPrefix, this, {
operator: this.operator.length === 1 ? this.operator : "!",
expression: expression
});
if (first_in_statement && expression && is_iife_call(expression)) {
if (expression === this.expression && this.operator == "!") return this;
return expression.negate(compressor, first_in_statement);
}
return expression;
});