How to use @webassemblyjs/wasm-edit - 10 common examples

const rewriteImportedGlobals = state => bin => {
	const additionalInitCode = state.additionalInitCode;
	const newGlobals = [];

	bin = editWithAST(state.ast, bin, {
		ModuleImport(path) {
			if (t.isGlobalType(path.node.descr) === true) {
				const globalType = path.node.descr;

				globalType.mutability = "var";

				const init = createDefaultInitForGlobal(globalType);

				newGlobals.push(t.global(globalType, [init]));

				path.remove();
			}
		},

		// in order to preserve non-imported global's order we need to re-inject
		// those as well

function transformWasm(ast, bin) {
  return editWithAST(ast, bin, {

    // FIXME(sven): fix https://github.com/webpack/webpack/issues/7454
    Elem({node}) {
      const offset = t.objectInstruction("const", "i32", [
        t.numberLiteralFromRaw(0)
      ]);

      node.offset = [offset];
    },

    ModuleImport({node}) {

      // Webpack only allows memory and table imports from another wasm
      if (node.name === "memory" || node.name === "table") {
        node.module = "/tmp/hack.wasm";
      }

const rewriteImportedGlobals = state => bin => {
	const additionalInitCode = state.additionalInitCode;
	const newGlobals = [];

	bin = editWithAST(state.ast, bin, {
		ModuleImport(path) {
			if (t.isGlobalType(path.node.descr) === true) {
				const globalType = path.node.descr;

				globalType.mutability = "var";

				const init = createDefaultInitForGlobal(globalType);

				newGlobals.push(t.global(globalType, [init]));

				path.remove();
			}
		},

		// in order to preserve non-imported global's order we need to re-inject
		// those as well

const funcSignature = t.signature(funcParams, funcResults);
	const func = t.func(initFuncId, funcSignature, funcBody);

	// Type section
	const functype = t.typeInstruction(undefined, funcSignature);

	// Func section
	const funcindex = t.indexInFuncSection(nextTypeIndex);

	// Export section
	const moduleExport = t.moduleExport(
		initFuncId.value,
		t.moduleExportDescr("Func", nextFuncIndex)
	);

	return addWithAST(ast, bin, [func, moduleExport, funcindex, functype]);
};

const funcSignature = t.signature(funcParams, funcResults);
	const func = t.func(initFuncId, funcSignature, funcBody);

	// Type section
	const functype = t.typeInstruction(undefined, funcSignature);

	// Func section
	const funcindex = t.indexInFuncSection(nextTypeIndex);

	// Export section
	const moduleExport = t.moduleExport(
		initFuncId.value,
		t.moduleExportDescr("Func", nextFuncIndex)
	);

	return addWithAST(ast, bin, [func, moduleExport, funcindex, functype]);
};

const funcSignature = t.signature(funcParams, funcResults);
	const func = t.func(initFuncId, funcSignature, funcBody);

	// Type section
	const functype = t.typeInstruction(undefined, funcSignature);

	// Func section
	const funcindex = t.indexInFuncSection(nextTypeIndex);

	// Export section
	const moduleExport = t.moduleExport(
		initFuncId.value,
		t.moduleExportDescr("Func", nextFuncIndex)
	);

	return addWithAST(ast, bin, [func, moduleExport, funcindex, functype]);
};

* They have the same indices than the init params, so use the
					 * same index.
					 */
					t.instruction("get_local", [initialGlobalidx]),
					t.instruction("set_global", [t.indexLiteral(newGlobals.length)])
				);
			}

			newGlobals.push(node);

			path.remove();
		}
	});

	// Add global declaration instructions
	return addWithAST(state.ast, bin, newGlobals);
};

* They have the same indices as the init params, so use the
					 * same index.
					 */
					t.instruction("get_local", [initialGlobalidx]),
					t.instruction("set_global", [t.indexLiteral(newGlobals.length)])
				);
			}

			newGlobals.push(node);

			path.remove();
		}
	});

	// Add global declaration instructions
	return addWithAST(state.ast, bin, newGlobals);
};

* They have the same indices than the init params, so use the
					 * same index.
					 */
					t.instruction("get_local", [initialGlobalidx]),
					t.instruction("set_global", [t.indexLiteral(newGlobals.length)])
				);
			}

			newGlobals.push(node);

			path.remove();
		}
	});

	// Add global declaration instructions
	return addWithAST(state.ast, bin, newGlobals);
};

const rewriteExportNames = ({ ast, module, externalExports }) => bin => {
	return editWithAST(ast, bin, {
		ModuleExport(path) {
			const isExternal = externalExports.has(path.node.name);
			if (isExternal) {
				path.remove();
				return;
			}
			const usedName = module.isUsed(path.node.name);
			if (!usedName) {
				path.remove();
				return;
			}
			path.node.name = usedName;
		}
	});
};