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バンドル最適化マニアクス at tfconf
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Koutarou Chikuba
May 14, 2022
Programming
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バンドル最適化マニアクス at tfconf
treeshake, DCE, terser mangling
Koutarou Chikuba
May 14, 2022
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Transcript
όϯυϧ࠷దԽϚχΞΫε @mizchi | Plaid, Inc at Techfeed Conference 2022
JS Ͱ͔͍ͬͱਏ͘ͳ͍ʁ
JS Ͱ͔͍ͬͱ͖… » ։ൃ࣌ » खݩͷϏϧυαΠΫϧ͕͍ » npm install Ͱ
CI ͕͍ » Ϣʔβʔମݧ » μϯϩʔυͰىಈ·Ͱ͕ͯ͘ਏ͍ » CPU ࠅͰόοςϦ͕ਏ͍
ϑϩϯτΤϯυվળ㲈Ϗϧυվળ
୭͕ԿΛվળ͢Δͷ͔ʁ » ΞϓϦέʔγϣϯ։ൃऀ: ϚΫϩνϡʔχϯά » Chunk Split / Treeshake »
ϥΠϒϥϦ։ൃऀ: ϚΠΫϩνϡʔχϯά » Treeshakable ͳ API ͷఏڙ » mangling
ࠓ͢༰ » جૅฤ: օ͕Δ͖ Treeshake+DCE » ্ڃฤ: ϥΠϒϥϦ։ൃऀͷͨΊͷϚΠΫϩνϡʔχϯά
جૅฤ: Treeshake + DCE
ESM Treeshake όϯυϥ(rollup/webpack)͕ ESM ͷະ༻ import Λআ͢Δػ ೳ import {a,
b} from "x"; console.log(a); // όϯυϧ࣌ʹ b ͕ফ͑Δ ※ ͨͩ͠ side effect (ޙड़) ͕ͳ͍લఏ
Treeshake ͷલఏΛ͑Δ τοϓϨϕϧͰ෭࡞༻Λى͜͢ͱ Treeshake Ͱ͖ͳ͘ͳΔ // test_shakable.js const offset =
new Date().getTimezoneOffset(); export const getOffset = () => offset; $ npx agadoo test_shakable.js # Rich-Harris/agadoo Failed to tree-shake test_shakable.js » new Date().getTimezoneOffset() ͕ Side Effect » جຊతʹτοϓϨϕϧͰ࣮ߦ͞ΕΔίʔυΛॻ͔ͳ͍
DCE: Dead Code Elimination ະ༻ίʔυΛআ͢Δ֤छ minifier ͷػೳ // source if(false){
unused; } export const x = true ? f() : -1; function f(){ return 1; unused;} // ΠϯϥΠϯల։ // out export const x=1;
Treeshake+DCEͷ࣮ફ
ݕূ༻ rollup.config.js import ts from "rollup-plugin-ts"; import { terser }
from "rollup-plugin-terser"; import replace from "@rollup/plugin-replace"; export default { plugins: [ ts({/* ུ */}), replace({ "process.env.NODE_ENV": JSON.stringify('production') }), terser(/* ུ */), ], }
ࠓճͷιʔείʔυ import { prod, dev } from "./sub"; // prod=0,
dev=1 export const ex = process.env.NODE_ENV === "production" ? prod : dev;
1. ఆల։ » process.env.NODE_ENV=production import { prod, dev } from
"./sub"; export const ex = "production" === "production" ? prod : dev;
2. ఆಉ࢜ͷධՁ » "production"==="production" => true import { prod, dev
} from "./sub"; export const ex = true ? prod : dev;
3. DCE » true?prod:dev => prod import { prod }
from "./sub"; export const ex = prod;
4. Bundle with Treeshake » prod=0 ͷΈల։ const prod =
0; export const ex = prod;
5. terser compress » ϩʔΧϧม໊Λѹॖ const o=0;export{ex as o}
Treeshake+DCE ͷ͍ํ » ڥ͝ͱʹఆల։Ͱ if(false){...} ͳ Dead Code Λ࡞Δ »
ϥΠϒϥϦ࡞ऀ: treeshakable ͳ API ઃܭΛ͢Δ » αΠζࢹͩͱϝιουνΣʔϯආ͚Δ » ϥΠϒϥϦར༻ऀ: ඞཁͳίʔυ͚ͩ import » ಛʹ import * as ... Λආ͚Δ » Ұ෦ͷϥΠϒϥϦ NODE_ENV=production ͰϏϧυ࣌࠷దԽ
ϚΠΫϩνϡʔχϯά্ڃฤ
terser ͱྑ͘ͳΔ » ΊͬͪΌݡ͍͜ͱΛ͢Δ͚Ͳҙ֎ͱ͙͢ఘΊΔͷͰࢹֶͯ͠΅͏ » https://try.terser.org/ ͕༑ୡ » ެ։ API
Ҏ֎શ෦ 1~2 จࣈʹ͢Δؾ࣋ͪͰ
compress: Կ͕͘ͳΔ͔ʁ // source const long_long_name_1: string = 'a'; const
long_long_name_2: string = 'b'; export const exported_name_is_not_shrinkable = long_long_name_1 + long_long_name_2; // out const o="ab";export{o as exported_name_is_not_shrinkable}; » ϩʔΧϧม֎ʹग़ͳ͍ͷͰ compress ର (module લఏ) » export ͞ΕΔ໊લ͘ͳΒͳ͍
compress: ϝϯόΞΫηεَ //source const x = { _private_value: 1, f()
{ return this._private_value;}, unused_prop2: 2, unused_prop3: 3, }; export const f = x.f; // out const e={_private_value:1,f(){return this._private_value}, unused_prop2:2,unused_prop3:3}.f;export{e as f};
compress: ΦϒδΣΫτΛΊΔͱ //source const private_value = 1; const unused_prop2 =
2; const unused_prop3 = 3; export const f = () => private_value; // out const o=()=>1;export{o as f};
͞Βʹൃలฤ: ෳճ minify // source const x = { A:
{ B: { v: 2, C: { D: { v:4, E: { F: { v: 6 } } }}} }}; console.log(x.A.B.v,x.A.B.C.D.v,x.A.B.C.D.E.F.v); /*1*/ const v={B:{v:2,C:{D:{v:4,E:{F:{v:6}}}}}};console.log(v.B.v,v.B.C.D.v,v.B.C.D.E.F.v); /*2*/ const v={v:2,C:{D:{v:4,E:{F:{v:6}}}}};console.log(v.v,v.C.D.v,v.C.D.E.F.v); /*3*/ const o=2,v={D:{v:4,E:{F:{v:6}}}};console.log(o,v.D.v,v.D.E.F.v); /*4*/ const o={v:4,E:{F:{v:6}}};console.log(2,o.v,o.E.F.v); /*5*/ const o=4,c={F:{v:6}};console.log(2,o,c.F.v); /*6*/ console.log(2,4,6); » terser ΞΫηεઌͷఆఆΛઙ͔ͬͯ͘͠ͳ͍ʂ » compress: { passes: 6 } (default: 1)
શ෦ఆԽͳΜͯ͑ΒΕͳ͍ਓ mangle.properties.regex ͕࠷ޙͷखஈ // rollup plugins terser({ mangle: { properties:
{ regex: "^_" } } }), ਖ਼نදݱΛຬͨͨ͠ϓϩύςΟΛ mangle ରʹ͢Δ ຊʹ ^_ ͕ϓϥΠϕʔτ͔Ͳ͏͔ਓ͕ؒ֬ೝ͠·͠ΐ͏
ϚΠΫϩνϡʔχϯά: TS ฤ (LTͰ࣌ؒແ͍ͷͰεΩοϓ)
TS: enum Λආ͚Δ // source enum XXX { AAA, BBB
} XXX[XXX.AAA]; // out var XXX; (function (XXX) { XXX[XXX["AAA"] = 0] = "AAA"; XXX[XXX["BBB"] = 1] = "BBB"; })(XXX || (XXX = {})); XXX[XXX.AAA];
TS: const enum Λ͏ // source const enum XXX {
AAA, BBB } console.log(XXX.AAA, XXX.BBB); // out console.log(0,1); » "preserveConstEnum": false ͰݩΩʔΛফͤΔ » ݩΩʔ͕Βͳ͍ͷͰ XXX[XXX.AAA] Ͱ͖ͳ͍
TS: private ҙຯͳ͍ class C { constructor(private __private_x: number) {}
private _private_method() { return this.__private_x;} public f() { return this._private_method();} } console.log(new C(1).f()); // out console.log(new class{constructor(t){this.__private_x=t}_private_method() {return this.__private_x}f(){return this._private_method()}}(1).f()); » terser TS ͷܕใͷ߹ͳΜͯΒͳ͍
TS: ߏମʹ named tuple Λ͏ type Range = [start: number,
end: number]; const range: Range = [1, 3]; const inRange = (x: number, [start, end]: Range) => { return start <= x && x <= end; } » ݻఆͷྻͷϝϯόʹ໊લΛ͚ͭΔ͜ͱ͕Ͱ͖Δ » ϓϩύςΟ໊͕ index ͳͷͰม໊ͷίετ͕গͳ͍ » (3 ݸҎ্ͩͱਓ͕ؒ͠ΜͲ͘ͳͬͯ͘Δ)
TS: ύϑΥʔϚϯεͷͨΊͷ tsconfig.json { "compilerOptions": { "target": "es2019", // 2017
Ҏ߱ async await Λม͠ͳ͍ "importHelpers": true, // tslib Λ͏ "preserveConstEnums": false, // enum ͷΠϯϥΠϯల։Λڧ੍ "noUnusedLocals": true, // ະ༻มͷܯࠂ "noUnusedParameters": true, // ະ༻Ҿͷܯࠂ "importsNotUsedAsValues": "error", // import type ͷڧ੍ } }
࣮ફ݁Ռͷհ
࣮ફ݁Ռ: @mizchi/mints » αΠζಛԽͷ TypeScript ίϯύΠϥ: 8.1 kb(gzip) // npm
install --save @mizchi/mints import { transformSync } from "@mizchi/mints"; const out = transfromSync("const x: number = 1;"); console.log(out.code); // const x=1;
Ͳ͏ͬͯখ͔ͨ͘͞͠ » ࣗ࡞ύʔαίϯϏωʔλͰ named tuple ͷߏจఆٛΛు͘ » ߏจఆٛΛ cbor ͰόΠφϦʹѹॖ
» ϥϯλΠϜʹόΠφϦΛΠϯϥΠϯԽ » ϕϯνऔΔͱ֎෦ binary Λ fetch ͢ΔΑΓஅવ͔ͬͨ » (ASIະରԠͰ prettier Λલఏ)
None
Shakerphobia ͷհ » ࡞ https://shakerphobia.netlify.app/ » bundlephobia ͰΘ͔Βͳ͍ treeshake ޙͷαΠζΛܭଌ
» skypack + webworker + rollup ͰϒϥβͰϏϧυ
·ͱΊ » ͳΜʹͤΑ Treeshake ͷཧղ͕େࣄ » terser ϝϯόΞΫηεʹऑ͍ » ಛʹΦϒδΣΫτఆΛආ͚Α͏
» ࠷ऴखஈͱͯ͠ mangle.properties.regex » ϥΠϒϥϦ࡞ऀґଘπϦʔ্ͷෛՙ͔ͩΒؤுΕ (কདྷతʹ TS ܕใͬͯ Side Effect ఆ͢Δ minifier ͕ग़Δͱࢥ͏͚Ͳɺݱঢ়ͳ͍Ͱ͢)
͓ΘΓ