Merge pull request #1383 from endojs/cjs-bundling

feat(compartment-mapper): support bundling cjs

Author: kumavis

packages/compartment-mapper/src/bundle-cjs.js

@@ -0,0 +1,55 @@
+/** quotes strings */
+const q = JSON.stringify;
+
+const exportsCellRecord = exportsList =>
+  ''.concat(
+    ...exportsList.map(
+      exportName => `\
+      ${exportName}: cell(${q(exportName)}),
+`,
+    ),
+  );
+
+// This function is serialized and references variables from its destination scope.
+const runtime = function wrapCjsFunctor(num) {
+  /* eslint-disable no-undef */
+  return ({ imports = {} }) => {
+    const cModule = Object.freeze(
+      Object.defineProperty({}, 'exports', cells[num].default),
+    );
+    // TODO: specifier not found handling
+    const requireImpl = specifier => cells[imports[specifier]].default.get();
+    functors[num](Object.freeze(requireImpl), cModule.exports, cModule);
+    Object.keys(cells[num])
+      .filter(k => k !== 'default' && k !== '*')
+      .map(k => cells[num][k].set(cModule.exports[k]));
+  };
+  /* eslint-enable no-undef */
+}.toString();
+
+export default {
+  runtime,
+  getBundlerKit({
+    index,
+    indexedImports,
+    record: { cjsFunctor, exports: exportsList = {} },
+  }) {
+    const importsMap = JSON.stringify(indexedImports);
+
+    return {
+      getFunctor: () => `\
+// === functors[${index}] ===
+${cjsFunctor},
+`,
+      getCells: () => `\
+    {
+${exportsCellRecord(exportsList)}\
+    },
+`,
+      getReexportsWiring: () => '',
+      getFunctorCall: () => `\
+  wrapCjsFunctor(${index})({imports: ${importsMap}});
+`,
+    };
+  },
+};

packages/compartment-mapper/src/bundle-mjs.js

@@ -0,0 +1,120 @@
+/** quotes strings */
+const q = JSON.stringify;
+
+const exportsCellRecord = exportMap =>
+  ''.concat(
+    ...Object.keys(exportMap).map(
+      exportName => `\
+      ${exportName}: cell(${q(exportName)}),
+`,
+    ),
+  );
+
+const importsCellSetter = (exportMap, index) =>
+  ''.concat(
+    ...Object.entries(exportMap).map(
+      ([exportName, [importName]]) => `\
+      ${importName}: cells[${index}].${exportName}.set,
+`,
+    ),
+  );
+
+const adaptReexport = reexportMap => {
+  if (!reexportMap) {
+    return {};
+  }
+  const ret = Object.fromEntries(
+    Object.values(reexportMap)
+      .flat()
+      .map(([local, exported]) => [exported, [local]]),
+  );
+  return ret;
+};
+
+export const runtime = `\
+function observeImports(map, importName, importIndex) {
+  for (const [name, observers] of map.get(importName)) {
+    const cell = cells[importIndex][name];
+    if (cell === undefined) {
+      throw new ReferenceError(\`Cannot import name \${name}\`);
+    }
+    for (const observer of observers) {
+      cell.observe(observer);
+    }
+  }
+}
+`;
+
+export default {
+  runtime,
+  getBundlerKit({
+    index,
+    indexedImports,
+    record: {
+      __syncModuleProgram__,
+      __fixedExportMap__ = {},
+      __liveExportMap__ = {},
+      __reexportMap__ = {},
+      reexports,
+    },
+  }) {
+    return {
+      getFunctor: () => `\
+// === functors[${index}] ===
+${__syncModuleProgram__},
+`,
+      getCells: () => `\
+    {
+${exportsCellRecord(__fixedExportMap__)}${exportsCellRecord(
+        __liveExportMap__,
+      )}${exportsCellRecord(adaptReexport(__reexportMap__))}\
+    },
+`,
+      getReexportsWiring: () => {
+        const mappings = reexports.map(
+          importSpecifier => `\
+  Object.defineProperties(cells[${index}], Object.getOwnPropertyDescriptors(cells[${indexedImports[importSpecifier]}]));
+`,
+        );
+        // Create references for export name as newname
+        const namedReexportsToProcess = Object.entries(__reexportMap__);
+        if (namedReexportsToProcess.length > 0) {
+          mappings.push(`
+  Object.defineProperties(cells[${index}], {${namedReexportsToProcess.map(
+            ([specifier, renames]) => {
+              return renames.map(
+                ([localName, exportedName]) =>
+                  `${q(exportedName)}: { value: cells[${
+                    indexedImports[specifier]
+                  }][${q(localName)}] }`,
+              );
+            },
+          )} });
+`);
+        }
+        return mappings.join('');
+      },
+      getFunctorCall: () => `\
+  functors[${index}]({
+    imports(entries) {
+      const map = new Map(entries);
+  ${''.concat(
+    ...Object.entries(indexedImports).map(
+      ([importName, importIndex]) => `\
+    observeImports(map, ${q(importName)}, ${importIndex});
+  `,
+    ),
+  )}\
+  },
+    liveVar: {
+  ${importsCellSetter(__liveExportMap__, index)}\
+  },
+    onceVar: {
+${importsCellSetter(__fixedExportMap__, index)}\
+    },
+    importMeta: {},
+  });
+`,
+    };
+  },
+};