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feat(experimental-utils): extract isNodeOfType out of ast-utils' predicates #3677

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merged 1 commit into from Sep 3, 2021
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feat(experimental-utils): extract isNodeOfType out of ast-utils' predicates #3677

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37 changes: 12 additions & 25 deletions packages/experimental-utils/src/ast-utils/predicates.ts
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@@ -1,5 +1,12 @@
import { AST_NODE_TYPES, AST_TOKEN_TYPES, TSESTree } from '../ts-estree';

const isNodeOfType =
<NodeType extends AST_NODE_TYPES>(nodeType: NodeType) =>
(
node: TSESTree.Node | null | undefined,
): node is TSESTree.Node & { type: NodeType } =>
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node?.type === nodeType;

function isOptionalChainPunctuator(
token: TSESTree.Token,
): token is TSESTree.PunctuatorToken & { value: '?.' } {
Expand Down Expand Up @@ -69,11 +76,7 @@ function isTypeAssertion(
);
}

function isVariableDeclarator(
node: TSESTree.Node | undefined,
): node is TSESTree.VariableDeclarator {
return node?.type === AST_NODE_TYPES.VariableDeclarator;
}
const isVariableDeclarator = isNodeOfType(AST_NODE_TYPES.VariableDeclarator);

function isFunction(
node: TSESTree.Node | undefined,
Expand Down Expand Up @@ -130,17 +133,9 @@ function isFunctionOrFunctionType(
return isFunction(node) || isFunctionType(node);
}

function isTSFunctionType(
node: TSESTree.Node | undefined,
): node is TSESTree.TSFunctionType {
return node?.type === AST_NODE_TYPES.TSFunctionType;
}
const isTSFunctionType = isNodeOfType(AST_NODE_TYPES.TSFunctionType);

function isTSConstructorType(
node: TSESTree.Node | undefined,
): node is TSESTree.TSConstructorType {
return node?.type === AST_NODE_TYPES.TSConstructorType;
}
const isTSConstructorType = isNodeOfType(AST_NODE_TYPES.TSConstructorType);

function isClassOrTypeElement(
node: TSESTree.Node | undefined,
Expand Down Expand Up @@ -193,20 +188,12 @@ function isSetter(
);
}

function isIdentifier(
node: TSESTree.Node | undefined,
): node is TSESTree.Identifier {
return node?.type === AST_NODE_TYPES.Identifier;
}
const isIdentifier = isNodeOfType(AST_NODE_TYPES.Identifier);

/**
* Checks if a node represents an `await …` expression.
*/
function isAwaitExpression(
node: TSESTree.Node | undefined | null,
): node is TSESTree.AwaitExpression {
return node?.type === AST_NODE_TYPES.AwaitExpression;
}
const isAwaitExpression = isNodeOfType(AST_NODE_TYPES.AwaitExpression);

/**
* Checks if a possible token is the `await` keyword.
Expand Down