9abcca345a
Also: - Cleaned up existing tags so they're consistently at the bottom of doc comments where they should be - Cleaned up some unused imports while I was taking a pass over the files - Marked one function `@deprecated` that should be deprecated
53 lines
2.6 KiB
TypeScript
53 lines
2.6 KiB
TypeScript
// Copyright 2016-2018, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file provides a low-level interface to a few V8 runtime objects. We will use this low-level
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// interface when serializing closures to walk the scope chain and find the value of free variables
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// captured by closures, as well as getting source-level debug information so that we can present
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// high-quality error messages.
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//
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// As a side-effect of importing this file, we must enable the --allow-natives-syntax V8 flag. This
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// is because we are using V8 intrinsics in order to implement this module.
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import * as v8 from "v8";
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v8.setFlagsFromString("--allow-natives-syntax");
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import * as v8Hooks from "./v8Hooks";
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import * as v8_v10andLower from "./v8_v10andLower";
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import * as v8_v11andHigher from "./v8_v11andHigher";
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// Node majorly changed their introspection apis between 10.0 and 11.0 (removing outright some
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// of the APIs we use). Detect if we're before or after this change and delegate to the
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const versionSpecificV8Module = v8Hooks.isNodeAtLeastV11 ? v8_v11andHigher : v8_v10andLower;
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/**
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* Given a function and a free variable name, lookupCapturedVariableValue looks up the value of that free variable
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* in the scope chain of the provided function. If the free variable is not found, `throwOnFailure` indicates
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* whether or not this function should throw or return `undefined.
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*
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* @param func The function whose scope chain is to be analyzed
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* @param freeVariable The name of the free variable to inspect
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* @param throwOnFailure If true, throws if the free variable can't be found.
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* @returns The value of the free variable. If `throwOnFailure` is false, returns `undefined` if not found.
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* @internal
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*/
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export const lookupCapturedVariableValueAsync = versionSpecificV8Module.lookupCapturedVariableValueAsync;
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/**
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* Given a function, returns the file, line and column number in the file where this function was
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* defined. Returns { "", 0, 0 } if the location cannot be found or if the given function has no Script.
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* @internal
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*/
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export const getFunctionLocationAsync = versionSpecificV8Module.getFunctionLocationAsync;
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