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feat(experimental-utils): extract ast-utils' predicates' helpers #3976

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merged 1 commit into from
Oct 14, 2021
Merged

feat(experimental-utils): extract ast-utils' predicates' helpers #3976

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37 changes: 37 additions & 0 deletions packages/experimental-utils/src/ast-utils/helpers.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
import { AST_NODE_TYPES, TSESTree } from '../ts-estree';

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

export const isNodeOfTypes =
<NodeTypes extends readonly AST_NODE_TYPES[]>(nodeTypes: NodeTypes) =>
(
node: TSESTree.Node | null | undefined,
): node is TSESTree.Node & { type: NodeTypes[number] } =>
!!node && nodeTypes.includes(node.type);

type ObjectEntry<BaseType> = [keyof BaseType, BaseType[keyof BaseType]];
type ObjectEntries<BaseType> = Array<ObjectEntry<BaseType>>;
export const isNodeOfTypeWithConditions = <
NodeType extends AST_NODE_TYPES,
Conditions extends Partial<TSESTree.Node & { type: NodeType }>,
>(
nodeType: NodeType,
conditions: Conditions,
): ((
node: TSESTree.Node | null | undefined,
) => node is TSESTree.Node & { type: NodeType } & Conditions) => {
const entries = Object.entries(conditions) as ObjectEntries<
TSESTree.Node & { type: NodeType }
>;

return (
node: TSESTree.Node | null | undefined,
): node is TSESTree.Node & { type: NodeType } & Conditions =>
node?.type === nodeType &&
entries.every(([key, value]) => node[key] === value);
};
40 changes: 5 additions & 35 deletions packages/experimental-utils/src/ast-utils/predicates.ts
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Original file line number Diff line number Diff line change
@@ -1,40 +1,10 @@
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 } =>
node?.type === nodeType;

const isNodeOfTypes =
<NodeTypes extends readonly AST_NODE_TYPES[]>(nodeTypes: NodeTypes) =>
(
node: TSESTree.Node | null | undefined,
): node is TSESTree.Node & { type: NodeTypes[number] } =>
!!node && nodeTypes.includes(node.type);

type ObjectEntry<BaseType> = [keyof BaseType, BaseType[keyof BaseType]];
type ObjectEntries<BaseType> = Array<ObjectEntry<BaseType>>;
const isNodeOfTypeWithConditions = <
NodeType extends AST_NODE_TYPES,
Conditions extends Partial<TSESTree.Node & { type: NodeType }>,
>(
nodeType: NodeType,
conditions: Conditions,
): ((
node: TSESTree.Node | null | undefined,
) => node is TSESTree.Node & { type: NodeType } & Conditions) => {
const entries = Object.entries(conditions) as ObjectEntries<
TSESTree.Node & { type: NodeType }
>;

return (
node: TSESTree.Node | null | undefined,
): node is TSESTree.Node & { type: NodeType } & Conditions =>
node?.type === nodeType &&
entries.every(([key, value]) => node[key] === value);
};
import {
isNodeOfType,
isNodeOfTypes,
isNodeOfTypeWithConditions,
} from './helpers';

function isOptionalChainPunctuator(
token: TSESTree.Token,
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