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introduce awaits (#4495)

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This commit is contained in:
Alex Lam S.L
2021-01-02 12:35:48 +00:00
committed by GitHub
parent b3a706114c
commit 15ef272790
3 changed files with 53 additions and 5 deletions
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25
lib/compress.js
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@@ -51,6 +51,7 @@ function Compressor(options, false_by_default) {
arguments : !false_by_default,
arrows : !false_by_default,
assignments : !false_by_default,
awaits : !false_by_default,
booleans : !false_by_default,
collapse_vars : !false_by_default,
comparisons : !false_by_default,
@@ -6651,6 +6652,7 @@ merge(Compressor.prototype, {
});
def(AST_AsyncFunction, return_null);
def(AST_Await, function(compressor) {
if (!compressor.option("awaits")) return this;
var exp = this.expression.drop_side_effect_free(compressor);
if (exp === this.expression) return this;
var node = this.clone();
@@ -6811,13 +6813,20 @@ merge(Compressor.prototype, {
var expressions = trim(this.expressions, compressor, first_in_statement);
if (!expressions) return null;
var end = expressions.length - 1;
var last = expressions[end];
if (compressor.option("awaits") && end > 0 && last instanceof AST_Await && last.expression.is_constant()) {
expressions = expressions.slice(0, -1);
end--;
last.expression = expressions[end];
expressions[end] = last;
}
var assign, cond, lhs;
if (compressor.option("conditionals")
&& end > 0
&& (assign = expressions[end - 1]) instanceof AST_Assign
&& assign.operator == "="
&& (lhs = assign.left) instanceof AST_SymbolRef
&& (cond = to_conditional_assignment(compressor, lhs.definition(), assign.right, expressions[end]))) {
&& (cond = to_conditional_assignment(compressor, lhs.definition(), assign.right, last))) {
assign = assign.clone();
assign.right = cond;
expressions = expressions.slice(0, -2);
@@ -8033,7 +8042,8 @@ merge(Compressor.prototype, {
}
}
var fn = exp instanceof AST_SymbolRef ? exp.fixed_value() : exp;
var is_func = fn instanceof AST_Lambda && (!is_async(fn) || compressor.parent() instanceof AST_Await);
var is_func = fn instanceof AST_Lambda && (!is_async(fn)
|| compressor.option("awaits") && compressor.parent() instanceof AST_Await);
var stat = is_func && fn.first_statement();
var has_default = false;
var can_drop = is_func && all(fn.argnames, function(argname, index) {
@@ -8665,6 +8675,7 @@ merge(Compressor.prototype, {
});
OPT(AST_Await, function(self, compressor) {
if (!compressor.option("awaits")) return self;
if (compressor.option("sequences")) {
var seq = lift_sequence_in_expression(self, compressor);
if (seq !== self) return seq.optimize(compressor);
@@ -8672,7 +8683,15 @@ merge(Compressor.prototype, {
if (compressor.option("side_effects")) {
var exp = self.expression;
if (exp instanceof AST_Await) return exp;
if (exp instanceof AST_UnaryPrefix && exp.expression instanceof AST_Await) return exp;
if (exp instanceof AST_UnaryPrefix) {
if (exp.expression instanceof AST_Await) return exp;
if (exp.operator == "void") return make_node(AST_UnaryPrefix, self, {
operator: "void",
expression: make_node(AST_Await, self, {
expression: exp.expression,
}),
});
}
}
return self;
});