planning

node_modules/@mapbox/mapbox-gl-style-spec/expression/expression.js

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+// @flow
+
+import type {Type} from './types.js';
+import type ParsingContext from './parsing_context.js';
+import type EvaluationContext from './evaluation_context.js';
+
+export type SerializedExpression = Array<mixed> | Array<string> | string | number | boolean | null;
+
+export interface Expression {
+    +type: Type;
+
+    evaluate(ctx: EvaluationContext): any;
+
+    eachChild(fn: Expression => void): void;
+
+    /**
+     * Statically analyze the expression, attempting to enumerate possible outputs. Returns
+     * false if the complete set of outputs is statically undecidable, otherwise true.
+     */
+    outputDefined(): boolean;
+
+    serialize(): SerializedExpression;
+}
+
+export type ExpressionParser = (args: $ReadOnlyArray<mixed>, context: ParsingContext) => ?Expression;
+export type ExpressionRegistration = Class<Expression> & { +parse: ExpressionParser };
+export type ExpressionRegistry = {[_: string]: ExpressionRegistration};