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test/js-native-api/test_bigint/binding.gyp

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+{
+  "targets": [
+    {
+      "target_name": "test_bigint",
+      "sources": [
+        "test_bigint.c"
+      ]
+    }
+  ]
+}

test/js-native-api/test_bigint/test.js

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+'use strict';
+const common = require('../../common');
+const assert = require('assert');
+const {
+  IsLossless,
+  TestInt64,
+  TestUint64,
+  TestWords,
+  CreateTooBigBigInt,
+  MakeBigIntWordsThrow,
+} = require(`./build/${common.buildType}/test_bigint`);
+
+[
+  0n,
+  -0n,
+  1n,
+  -1n,
+  100n,
+  2121n,
+  -1233n,
+  986583n,
+  -976675n,
+  98765432213456789876546896323445679887645323232436587988766545658n,
+  -4350987086545760976737453646576078997096876957864353245245769809n,
+].forEach((num) => {
+  if (num > -(2n ** 63n) && num < 2n ** 63n) {
+    assert.strictEqual(TestInt64(num), num);
+    assert.strictEqual(IsLossless(num, true), true);
+  } else {
+    assert.strictEqual(IsLossless(num, true), false);
+  }
+
+  if (num >= 0 && num < 2n ** 64n) {
+    assert.strictEqual(TestUint64(num), num);
+    assert.strictEqual(IsLossless(num, false), true);
+  } else {
+    assert.strictEqual(IsLossless(num, false), false);
+  }
+
+  assert.strictEqual(num, TestWords(num));
+});
+
+assert.throws(() => CreateTooBigBigInt(), {
+  name: 'Error',
+  message: 'Invalid argument',
+});
+
+// Test that we correctly forward exceptions from the engine.
+assert.throws(() => MakeBigIntWordsThrow(), {
+  name: 'RangeError',
+  message: 'Maximum BigInt size exceeded',
+});

test/js-native-api/test_bigint/test_bigint.c

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+#include <inttypes.h>
+#include <js_native_api.h>
+#include <limits.h>
+#include <stdio.h>
+#include "../common.h"
+#include "../entry_point.h"
+
+static napi_value IsLossless(napi_env env, napi_callback_info info) {
+  size_t argc = 2;
+  napi_value args[2];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  bool is_signed;
+  NODE_API_CALL(env, napi_get_value_bool(env, args[1], &is_signed));
+
+  bool lossless;
+
+  if (is_signed) {
+    int64_t input;
+    NODE_API_CALL(env, napi_get_value_bigint_int64(env, args[0], &input, &lossless));
+  } else {
+    uint64_t input;
+    NODE_API_CALL(env, napi_get_value_bigint_uint64(env, args[0], &input, &lossless));
+  }
+
+  napi_value output;
+  NODE_API_CALL(env, napi_get_boolean(env, lossless, &output));
+
+  return output;
+}
+
+static napi_value TestInt64(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NODE_API_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype0;
+  NODE_API_CALL(env, napi_typeof(env, args[0], &valuetype0));
+
+  NODE_API_ASSERT(env, valuetype0 == napi_bigint,
+      "Wrong type of arguments. Expects a bigint as first argument.");
+
+  int64_t input;
+  bool lossless;
+  NODE_API_CALL(env, napi_get_value_bigint_int64(env, args[0], &input, &lossless));
+
+  napi_value output;
+  NODE_API_CALL(env, napi_create_bigint_int64(env, input, &output));
+
+  return output;
+}
+
+static napi_value TestUint64(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NODE_API_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype0;
+  NODE_API_CALL(env, napi_typeof(env, args[0], &valuetype0));
+
+  NODE_API_ASSERT(env, valuetype0 == napi_bigint,
+      "Wrong type of arguments. Expects a bigint as first argument.");
+
+  uint64_t input;
+  bool lossless;
+  NODE_API_CALL(env, napi_get_value_bigint_uint64(
+        env, args[0], &input, &lossless));
+
+  napi_value output;
+  NODE_API_CALL(env, napi_create_bigint_uint64(env, input, &output));
+
+  return output;
+}
+
+static napi_value TestWords(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NODE_API_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NODE_API_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype valuetype0;
+  NODE_API_CALL(env, napi_typeof(env, args[0], &valuetype0));
+
+  NODE_API_ASSERT(env, valuetype0 == napi_bigint,
+      "Wrong type of arguments. Expects a bigint as first argument.");
+
+  size_t expected_word_count;
+  NODE_API_CALL(env, napi_get_value_bigint_words(
+        env, args[0], NULL, &expected_word_count, NULL));
+
+  int sign_bit;
+  size_t word_count = 10;
+  uint64_t words[10];
+
+  NODE_API_CALL(env, napi_get_value_bigint_words(
+        env, args[0], &sign_bit, &word_count, words));
+
+  NODE_API_ASSERT(env, word_count == expected_word_count,
+      "word counts do not match");
+
+  napi_value output;
+  NODE_API_CALL(env, napi_create_bigint_words(
+        env, sign_bit, word_count, words, &output));
+
+  return output;
+}
+
+// throws RangeError
+static napi_value CreateTooBigBigInt(napi_env env, napi_callback_info info) {
+  int sign_bit = 0;
+  size_t word_count = SIZE_MAX;
+  uint64_t words[10] = {0};
+
+  napi_value output;
+
+  NODE_API_CALL(env, napi_create_bigint_words(
+        env, sign_bit, word_count, words, &output));
+
+  return output;
+}
+
+// Test that we correctly forward exceptions from the engine.
+static napi_value MakeBigIntWordsThrow(napi_env env, napi_callback_info info) {
+  uint64_t words[10] = {0};
+  napi_value output;
+
+  napi_status status = napi_create_bigint_words(env,
+                                                0,
+                                                INT_MAX,
+                                                words,
+                                                &output);
+  if (status != napi_pending_exception)
+    napi_throw_error(env, NULL, "Expected status `napi_pending_exception`");
+
+  return NULL;
+}
+
+EXTERN_C_START
+napi_value Init(napi_env env, napi_value exports) {
+  napi_property_descriptor descriptors[] = {
+    DECLARE_NODE_API_PROPERTY("IsLossless", IsLossless),
+    DECLARE_NODE_API_PROPERTY("TestInt64", TestInt64),
+    DECLARE_NODE_API_PROPERTY("TestUint64", TestUint64),
+    DECLARE_NODE_API_PROPERTY("TestWords", TestWords),
+    DECLARE_NODE_API_PROPERTY("CreateTooBigBigInt", CreateTooBigBigInt),
+    DECLARE_NODE_API_PROPERTY("MakeBigIntWordsThrow", MakeBigIntWordsThrow),
+  };
+
+  NODE_API_CALL(env, napi_define_properties(
+      env, exports, sizeof(descriptors) / sizeof(*descriptors), descriptors));
+
+  return exports;
+}
+EXTERN_C_END