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drop unused: toplevel, assign-only

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- assign statement does not count towards variable usage by default
- only works with assignments on the same scope level as declaration
- can be disabled with `unused` set to "keep_assign"
- `toplevel` to drop unused top-level variables and/or functions
- `top_retain` to whitelist top-level exceptions

closes #1450
This commit is contained in:
alexlamsl
2017-02-18 19:03:53 +08:00
parent d11dca3cf9
commit 148047fbbf
4 changed files with 565 additions and 10 deletions
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379
test/compress/drop-unused.js
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@@ -177,3 +177,382 @@ keep_fnames: {
}
}
}
drop_assign: {
options = { unused: true };
input: {
function f1() {
var a;
a = 1;
}
function f2() {
var a = 1;
a = 2;
}
function f3(a) {
a = 1;
}
function f4() {
var a;
return a = 1;
}
function f5() {
var a;
return function() {
a = 1;
}
}
}
expect: {
function f1() {
1;
}
function f2() {
2;
}
function f3(a) {
1;
}
function f4() {
return 1;
}
function f5() {
var a;
return function() {
a = 1;
}
}
}
}
keep_assign: {
options = { unused: "keep_assign" };
input: {
function f1() {
var a;
a = 1;
}
function f2() {
var a = 1;
a = 2;
}
function f3(a) {
a = 1;
}
function f4() {
var a;
return a = 1;
}
function f5() {
var a;
return function() {
a = 1;
}
}
}
expect: {
function f1() {
var a;
a = 1;
}
function f2() {
var a = 1;
a = 2;
}
function f3(a) {
a = 1;
}
function f4() {
var a;
return a = 1;
}
function f5() {
var a;
return function() {
a = 1;
}
}
}
}
drop_toplevel_funcs: {
options = { toplevel: "funcs", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, b = 1, c = g;
a = 2;
function g() {}
console.log(b = 3);
}
}
drop_toplevel_vars: {
options = { toplevel: "vars", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var c = g;
function f(d) {
return function() {
c = 2;
}
}
2;
function g() {}
function h() {}
console.log(3);
}
}
drop_toplevel_vars_fargs: {
options = { keep_fargs: false, toplevel: "vars", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var c = g;
function f() {
return function() {
c = 2;
}
}
2;
function g() {}
function h() {}
console.log(3);
}
}
drop_toplevel_all: {
options = { toplevel: true, unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
2;
console.log(3);
}
}
drop_toplevel_retain: {
options = { top_retain: "f,a,o", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
console.log(3);
}
}
drop_toplevel_retain_array: {
options = { top_retain: [ "f", "a", "o" ], unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
console.log(3);
}
}
drop_toplevel_retain_regex: {
options = { top_retain: /^[fao]$/, unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
console.log(3);
}
}
drop_toplevel_all_retain: {
options = { toplevel: true, top_retain: "f,a,o", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
console.log(3);
}
}
drop_toplevel_funcs_retain: {
options = { toplevel: "funcs", top_retain: "f,a,o", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
console.log(b = 3);
}
}
drop_toplevel_vars_retain: {
options = { toplevel: "vars", top_retain: "f,a,o", unused: true };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(3);
}
}
drop_toplevel_keep_assign: {
options = { toplevel: true, unused: "keep_assign" };
input: {
var a, b = 1, c = g;
function f(d) {
return function() {
c = 2;
}
}
a = 2;
function g() {}
function h() {}
console.log(b = 3);
}
expect: {
var a, b = 1;
a = 2;
console.log(b = 3);
}
}