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Diffstat (limited to 'node_modules/terser/lib/compress/native-objects.js')
| -rw-r--r-- | node_modules/terser/lib/compress/native-objects.js | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/node_modules/terser/lib/compress/native-objects.js b/node_modules/terser/lib/compress/native-objects.js new file mode 100644 index 00000000..d7cb7042 --- /dev/null +++ b/node_modules/terser/lib/compress/native-objects.js @@ -0,0 +1,206 @@ +/*********************************************************************** + + A JavaScript tokenizer / parser / beautifier / compressor. + https://github.com/mishoo/UglifyJS2 + + -------------------------------- (C) --------------------------------- + + Author: Mihai Bazon + <mihai.bazon@gmail.com> + http://mihai.bazon.net/blog + + Distributed under the BSD license: + + Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com> + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above + copyright notice, this list of conditions and the following + disclaimer. + + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following + disclaimer in the documentation and/or other materials + provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY + EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, + OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF + THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + SUCH DAMAGE. + + ***********************************************************************/ + +import { makePredicate } from "../utils/index.js"; + +// Lists of native methods, useful for `unsafe` option which assumes they exist. +// Note: Lots of methods and functions are missing here, in case they aren't pure +// or not available in all JS environments. + +function make_nested_lookup(obj) { + const out = new Map(); + for (var key of Object.keys(obj)) { + out.set(key, makePredicate(obj[key])); + } + + const does_have = (global_name, fname) => { + const inner_map = out.get(global_name); + return inner_map != null && inner_map.has(fname); + }; + return does_have; +} + +// Objects which are safe to access without throwing or causing a side effect. +// Usually we'd check the `unsafe` option first but these are way too common for that +export const pure_prop_access_globals = new Set([ + "Number", + "String", + "Array", + "Object", + "Function", + "Promise", +]); + +const object_methods = [ + "constructor", + "toString", + "valueOf", +]; + +export const is_pure_native_method = make_nested_lookup({ + Array: [ + "at", + "flat", + "includes", + "indexOf", + "join", + "lastIndexOf", + "slice", + ...object_methods, + ], + Boolean: object_methods, + Function: object_methods, + Number: [ + "toExponential", + "toFixed", + "toPrecision", + ...object_methods, + ], + Object: object_methods, + RegExp: [ + "test", + ...object_methods, + ], + String: [ + "at", + "charAt", + "charCodeAt", + "charPointAt", + "concat", + "endsWith", + "fromCharCode", + "fromCodePoint", + "includes", + "indexOf", + "italics", + "lastIndexOf", + "localeCompare", + "match", + "matchAll", + "normalize", + "padStart", + "padEnd", + "repeat", + "replace", + "replaceAll", + "search", + "slice", + "split", + "startsWith", + "substr", + "substring", + "repeat", + "toLocaleLowerCase", + "toLocaleUpperCase", + "toLowerCase", + "toUpperCase", + "trim", + "trimEnd", + "trimStart", + ...object_methods, + ], +}); + +export const is_pure_native_fn = make_nested_lookup({ + Array: [ + "isArray", + ], + Math: [ + "abs", + "acos", + "asin", + "atan", + "ceil", + "cos", + "exp", + "floor", + "log", + "round", + "sin", + "sqrt", + "tan", + "atan2", + "pow", + "max", + "min", + ], + Number: [ + "isFinite", + "isNaN", + ], + Object: [ + "create", + "getOwnPropertyDescriptor", + "getOwnPropertyNames", + "getPrototypeOf", + "isExtensible", + "isFrozen", + "isSealed", + "hasOwn", + "keys", + ], + String: [ + "fromCharCode", + ], +}); + +// Known numeric values which come with JS environments +export const is_pure_native_value = make_nested_lookup({ + Math: [ + "E", + "LN10", + "LN2", + "LOG2E", + "LOG10E", + "PI", + "SQRT1_2", + "SQRT2", + ], + Number: [ + "MAX_VALUE", + "MIN_VALUE", + "NaN", + "NEGATIVE_INFINITY", + "POSITIVE_INFINITY", + ], +}); |