1e51586996
A function call or IIFE with an immediately preceding comment containing `@__PURE__` or `#__PURE__` is deemed to be a side-effect-free pure function call and can potentially be dropped. Depends on `side_effects` option. `[#@]__PURE__` hint will be removed from comment when pure call is dropped. fixes #1261 closes #1448
119 lines
3.9 KiB
JavaScript
119 lines
3.9 KiB
JavaScript
pure_function_calls: {
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options = {
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evaluate : true,
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conditionals : true,
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comparisons : true,
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side_effects : true,
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booleans : true,
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unused : true,
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if_return : true,
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join_vars : true,
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cascade : true,
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negate_iife : true,
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}
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input: {
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// pure top-level IIFE will be dropped
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// @__PURE__ - comment
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(function() {
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console.log("iife0");
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})();
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// pure top-level IIFE assigned to unreferenced var will not be dropped
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var iife1 = /*@__PURE__*/(function() {
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console.log("iife1");
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function iife1() {}
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return iife1;
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})();
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(function(){
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// pure IIFE in function scope assigned to unreferenced var will be dropped
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var iife2 = /*#__PURE__*/(function() {
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console.log("iife2");
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function iife2() {}
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return iife2;
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})();
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})();
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// comment #__PURE__ comment
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bar(), baz(), quux();
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a.b(), /* @__PURE__ */ c.d.e(), f.g();
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}
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expect: {
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var iife1 = function() {
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console.log("iife1");
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function iife1() {}
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return iife1;
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}();
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baz(), quux();
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a.b(), f.g();
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}
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expect_warnings: [
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:17,8]",
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"WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:17,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:30,37]",
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"WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:30,16]",
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"WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:28,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:39,31]",
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]
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}
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pure_function_calls_toplevel: {
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options = {
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evaluate : true,
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conditionals : true,
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comparisons : true,
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side_effects : true,
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booleans : true,
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unused : true,
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if_return : true,
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join_vars : true,
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cascade : true,
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negate_iife : true,
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toplevel : true,
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}
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input: {
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// pure top-level IIFE will be dropped
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// @__PURE__ - comment
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(function() {
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console.log("iife0");
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})();
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// pure top-level IIFE assigned to unreferenced var will be dropped
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var iife1 = /*@__PURE__*/(function() {
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console.log("iife1");
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function iife1() {}
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return iife1;
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})();
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(function(){
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// pure IIFE in function scope assigned to unreferenced var will be dropped
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var iife2 = /*#__PURE__*/(function() {
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console.log("iife2");
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function iife2() {}
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return iife2;
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})();
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})();
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// comment #__PURE__ comment
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bar(), baz(), quux();
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a.b(), /* @__PURE__ */ c.d.e(), f.g();
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}
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expect: {
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baz(), quux();
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a.b(), f.g();
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}
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expect_warnings: [
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:79,8]",
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"WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:79,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
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"WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
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"WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,8]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:101,31]",
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"WARN: Dropping __PURE__ call [test/compress/issue-1261.js:84,33]",
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"WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:84,12]",
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]
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}
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