chore: Add new files.

integration/extension-import/base.ts

@@ -0,0 +1,79 @@
+/* eslint-disable */
+import _m0 from "protobufjs/minimal";
+
+export interface Extendable {
+  field: string;
+}
+
+function createBaseExtendable(): Extendable {
+  return { field: "" };
+}
+
+export const Extendable = {
+  encode(message: Extendable, writer: _m0.Writer = _m0.Writer.create()): _m0.Writer {
+    if (message.field !== "") {
+      writer.uint32(10).string(message.field);
+    }
+    return writer;
+  },
+
+  decode(input: _m0.Reader | Uint8Array, length?: number): Extendable {
+    const reader = input instanceof _m0.Reader ? input : _m0.Reader.create(input);
+    let end = length === undefined ? reader.len : reader.pos + length;
+    const message = createBaseExtendable();
+    while (reader.pos < end) {
+      const tag = reader.uint32();
+      switch (tag >>> 3) {
+        case 1:
+          if (tag !== 10) {
+            break;
+          }
+
+          message.field = reader.string();
+          continue;
+      }
+      if ((tag & 7) === 4 || tag === 0) {
+        break;
+      }
+      reader.skipType(tag & 7);
+    }
+    return message;
+  },
+
+  fromJSON(object: any): Extendable {
+    return { field: isSet(object.field) ? globalThis.String(object.field) : "" };
+  },
+
+  toJSON(message: Extendable): unknown {
+    const obj: any = {};
+    if (message.field !== "") {
+      obj.field = message.field;
+    }
+    return obj;
+  },
+
+  create<I extends Exact<DeepPartial<Extendable>, I>>(base?: I): Extendable {
+    return Extendable.fromPartial(base ?? ({} as any));
+  },
+  fromPartial<I extends Exact<DeepPartial<Extendable>, I>>(object: I): Extendable {
+    const message = createBaseExtendable();
+    message.field = object.field ?? "";
+    return message;
+  },
+};
+
+type Builtin = Date | Function | Uint8Array | string | number | boolean | undefined;
+
+type DeepPartial<T> = T extends Builtin ? T
+  : T extends globalThis.Array<infer U> ? globalThis.Array<DeepPartial<U>>
+  : T extends ReadonlyArray<infer U> ? ReadonlyArray<DeepPartial<U>>
+  : T extends {} ? { [K in keyof T]?: DeepPartial<T[K]> }
+  : Partial<T>;
+
+type KeysOfUnion<T> = T extends T ? keyof T : never;
+type Exact<P, I extends P> = P extends Builtin ? P
+  : P & { [K in keyof P]: Exact<P[K], I[K]> } & { [K in Exclude<keyof I, KeysOfUnion<P>>]: never };
+
+function isSet(value: any): boolean {
+  return value !== null && value !== undefined;
+}

integration/extension-import/index.foo.ts

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+/* eslint-disable */
+
+export * from "./base";

integration/extension-import/index.ts

@@ -0,0 +1,3 @@
+/* eslint-disable */
+
+export * as foo from "./index.foo";