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87 lines
1.3 KiB
87 lines
1.3 KiB
# @webassemblyjs/wasm-edit
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> Rewrite a WASM binary
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Replace in-place an AST node in the binary.
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## Installation
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```sh
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yarn add @webassemblyjs/wasm-edit
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```
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## Usage
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Update:
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```js
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import { edit } from "@webassemblyjs/wasm-edit";
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const binary = [/*...*/];
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const visitors = {
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ModuleImport({ node }) {
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node.module = "foo";
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node.name = "bar";
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}
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};
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const newBinary = edit(binary, visitors);
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```
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Replace:
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```js
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import { edit } from "@webassemblyjs/wasm-edit";
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const binary = [/*...*/];
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const visitors = {
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Instr(path) {
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const newNode = t.callInstruction(t.indexLiteral(0));
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path.replaceWith(newNode);
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}
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};
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const newBinary = edit(binary, visitors);
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```
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Remove:
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```js
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import { edit } from "@webassemblyjs/wasm-edit";
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const binary = [/*...*/];
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const visitors = {
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ModuleExport({ node }) {
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path.remove()
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}
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};
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const newBinary = edit(binary, visitors);
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```
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Insert:
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```js
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import { add } from "@webassemblyjs/wasm-edit";
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const binary = [/*...*/];
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const newBinary = add(actualBinary, [
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t.moduleImport("env", "mem", t.memory(t.limit(1)))
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]);
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```
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## Providing the AST
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Providing an AST allows you to handle the decoding yourself, here is the API:
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```js
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addWithAST(Program, ArrayBuffer, Array<Node>): ArrayBuffer;
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editWithAST(Program, ArrayBuffer, visitors): ArrayBuffer;
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```
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Note that the AST will be updated in-place.
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