Add obfuscateBuiltins and obfuscateApiCalls options#1385
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thkim2015 wants to merge 2 commits intojavascript-obfuscator:masterfrom
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Add obfuscateBuiltins and obfuscateApiCalls options#1385thkim2015 wants to merge 2 commits intojavascript-obfuscator:masterfrom
thkim2015 wants to merge 2 commits intojavascript-obfuscator:masterfrom
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Introduce two new obfuscation options that transform references to built-in JavaScript objects/functions and browser/Node.js API calls into indirect access patterns via globalThis, making reverse engineering significantly harder. - obfuscateBuiltins: transforms built-in identifiers (console, Math, JSON, etc.) into globalThis['name'] computed access patterns - obfuscateApiCalls: transforms API method calls (document.getElementById, fetch, etc.) into globalThis-based indirect access Both options are scope-aware (skip shadowed variables), target-aware (browser vs node built-in lists), and compatible with reservedNames, conditional comments, and stringArray extraction. SPEC: SPEC-OBFUSCATION-001 🗿 MoAI <[email protected]>
Enhance ApiCallsObfuscationTransformer with a new obfuscateApiCallsMode option
that controls whether to transform only API function calls ('calls-only', default)
or all member expression access patterns ('all-access').
In 'all-access' mode, non-call bracket/dot access like `document.body`,
`document['getElementById']`, and `navigator.userAgent` are also transformed
to `globalThis['document']['body']` etc, creating string literals extractable
by StringArrayTransformer.
Includes normalizer rule to reset mode to 'calls-only' when obfuscateApiCalls
is disabled.
SPEC: SPEC-OBFUSCATION-002
🗿 MoAI <[email protected]>
patchixgit
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Mar 21, 2026
patchixgit
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What if an environment does not have globalThis? It is not available in older browsers or older versions of Node.js. In these cases, a polyfill is needed to emulate its behavior.
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Summary
obfuscateBuiltinsoption: transforms built-in JavaScript identifiers (console, Math, JSON, Object, etc.) intoglobalThis['name']computed access patternsobfuscateApiCallsoption: transforms API method calls (document.getElementById, fetch, etc.) into globalThis-based indirect accessKey Design Decisions
console→globalThis['console']— creates string literals for StringArray extractionfalseby default.obfuscateBuiltins: truein high-obfuscation presetChanges
New Files (8)
src/constants/BuiltinIdentifierNames.ts— Categorized built-in lists (Core JS, Browser, Node.js)src/node-transformers/converting-transformers/BuiltinsObfuscationTransformer.tssrc/node-transformers/converting-transformers/ApiCallsObfuscationTransformer.tsModified Files (9)
IOptions.ts,Options.ts,Default.ts,HighObfuscation.ts,NoCustomNodes.tsNodeTransformer.ts,JavaScriptObfuscator.ts,ConvertingTransformersModule.tsJavaScriptObfuscatorCLI.tsTest plan
Examples
SPEC: SPEC-OBFUSCATION-001
🗿 MoAI [email protected]