@rekajs/types

Package for creating and interacting with Reka data types (ie: the AST and the View)

Installation

npm install @rekajs/types

Creating a new Type

To create a new type, use the builder function which will return a new Type instance:

tsx
import * as t from '@rekajs/types';
// Using the builder function
const literal = t.literal({
    value: 0
});
// or manually: new Literal({ value: 0 })

Checking an instance's type

tsx
import * as t from '@rekajs/types';
const literal = t.literal({ value : 0 });
console.log(literal instanceof t.Literal); // true
console.log(literal instanceof t.Expression); // true
console.log(literal instanceof t.RekaComponent); // false

API

State

Class

• program: Program

• extensions: Record<string,ExtensionState>

ASTNode

Class

• meta: Record<string,any>

Program

Class

• globals: Array<Val>

• components: Array<RekaComponent>

Kind

Class

AnyKind

Class

StringKind

Class

NumberKind

Class

• min: number | null

• max: number | null

BooleanKind

Class

ArrayKind

Class

• elements: Kind

OptionKind

Class

• options: Record<string,string>

CustomKind

Class

• name: string

Expression

Class

Identifiable

Class

• name: string

Variable

Class

• kind: Kind

• init: Expression | null

Literal

Class

• value: string | number | boolean

String

Class

• value: Array<union>

Identifier

Class

• name: string

• external: boolean

• identifiable: Identifiable | null

Val

Class

ArrayExpression

Class

• elements: Array<Expression>

BinaryExpression

Class

• left: Expression

• operator: "+" | "-" | "*" | "/" | "!=" | "==" | "<" | "<=" | ">" | ">=" | "||" | "&&" | "??" | "^" | "%"

• right: Expression

ObjectExpression

Class

• properties: Record<string,Expression>

Block

Class

• statements: Array<Expression>

Param

Class

Func

Class

• name: string | null

• params: Array<Param>

• body: Block

CallExpression

Class

• identifier: Identifier

• arguments: Array<Expression>

UnaryExpression

Class

• operator: "-" | "+"

• argument: Expression

ConditionalExpression

Class

• condition: Expression

• consequent: Expression

• alternate: Expression

IfStatement

Class

• condition: Expression

• consequent: Block

Assignment

Class

• left: Identifier | MemberExpression

• operator: "=" | "+=" | "-=" | "*=" | "/=" | "^=" | "%="

• right: Expression

MemberExpression

Class

• object: Identifier | MemberExpression

• property: Expression

ComponentProp

Class

• bindable: boolean

Component

Class

RekaComponent

Class

• template: Template | null

• state: Array<Val>

• props: Array<ComponentProp>

ExternalComponent

Class

• render: any

• props: Array<ComponentProp>

PropBinding

Class

• identifier: Identifier

Template

Class

• props: Record<string,Expression>

• if: Expression | null

• each: ElementEach | null

• classList: ObjectExpression | null

SlottableTemplate

Class

• children: Array<Template>

• slots: Record<string,Array>

FragmentTemplate

Class

RootTemplate

Class

TagTemplate

Class

• tag: string

ComponentTemplate

Class

• component: Identifier

SlotTemplate

Class

• name: string | null

• accepts: Identifier | null

ElementEachAlias

Class

ElementEachIndex

Class

ElementEach

Class

• alias: ElementEachAlias

• index: ElementEachIndex | null

• iterator: Expression

View

Class

• key: string

• template: Template

• frame: string

• owner: ComponentView | null

SlottableView

Class

• children: Array<View>

TagView

Class

• tag: string

• props: Record<string,any>

• bindings: Record<string,Function>

ComponentView

Class

• component: Component

FragmentView

Class

FrameView

Class

RekaComponentView

Class

• render: Array<View>

ExternalComponentView

Class

• props: Record<string,any>

SlotView

Class

• children: Array<View>

SystemView

Class

EachSystemView

Class

• children: Array<View>

ErrorSystemView

Class

• error: string

ExtensionState

Class

• value: Record | null

ExternalState

Class

• init: any

ExternalFunc

Class

• func: Function

Type

Class

• type: string

• id: string

Utilities

match(node: Any, visitor: Partial<Visitor>): void

Function

Match a callback to a Type

tsx
import * as t from '@rekajs/types';
const expr = t.literal({ value: 0 });
t.match(expr, {
  Literal: (type) => {
    // do stuff
  },
});
// If a callback for Literal is not specified,
// But a callback for the parent Type of Literal (in this case, Expression) will be used
t.match(expr, {
  Expression: (type) => {
    // do stuff
  },
});

isObjectLiteral(t: any): boolean

Function

toJS(value: any): any

Function

merge(a: any, b: any, opts?: Object): any

Function

Compare 2 Types and merge differences

tsx
import * as t from '@rekajs/types';
const a = t.binaryExpression({
  left: t.literal({ value: 2 }),
  operator: '<',
  right: t.literal({ value: 4 }),
});
const b = t.binaryExpression({
  left: t.literal({ value: 10 }),
  operator: '<',
  right: t.literal({ value: 4 }),
});
t.merge(a, b);
// Changes from 'b' is applied on a
console.log(a.left.value === b.left.value); // true

flatten(root: Type): Object

Function

Flatten a Type and its children

tsx
import * as t from '@rekajs/types';
const expr = t.binaryExpression({
    left: t.literal({ value: 2 }),
    operator: '+',
    right: t.literal({ value: 4 })
});
t.flatten(expr);
// flattened
{
    root: "root-id",
    types: {
        "root-id": {
            type: "BinaryExpression",
            left: {
                $$typeId: "left-id",
            },
            operator: "+",
            right: {
                $$typeId: "right-id",
            }
        },
        "left-id": {
            type: "Literal",
            value: 2
        },
        "right-id": {
            type: "Literal",
            value: 4
        }
    }
}

unflatten(flattenedType: FlattenedType): any

Function

Restore a flattend Type

tsx
import * as t from '@rekajs/types';
const flattened = { types: {...}, root: "..." };
const type = t.unflatten(flattened)
console.log(type instanceof t.Type) // true

collect(type: Type): Array<Type>

Function

Collect all child Types within a given Type

tsx
import * as t from '@rekajs/types';
const expr = t.binaryExpression({
  left: t.literal({ value: 1 }),
  operator: '+',
  right: t.literal({ value: 2 }),
});
const collectedTypes = t.collect(expr);
// collectedTypes = [t.BinaryExpression(...), t.Literal({ value : 1 }), t.Literal({ value: 2 })]

is<T extends Type>(value: any, type: intersection<Function,Object>): boolean

Function

assert<T extends Type>(value: any, assertedType: intersection<Function,Object>): T

assert<T extends Type, C extends Function>(value: any, assertedType: intersection<Function,Object>, cb: C): ReturnType<C>

Function

Assert a value's Type

tsx
import * as t from '@rekajs/types';
t.assert(t.literal({ value: 0 }), t.Literal); // ok
t.assert(t.identifier({ name: 'counter' }), t.Literal); // throws
// Specify an optional callback to traverse and return a value from the asserted type
const expr = t.assert(
  t.binaryExpression({
    left: t.literal({ value: 1 }),
    operator: '+',
    right: t.literal({ value: 2 }),
  }),
  t.BinaryExpression,
  (value) => {
    return t.left;
  }
);
console.log(expr instanceof t.Expression); // true

getRootIdentifierInMemberExpression(expr: MemberExpression): Identifier

Function

clone(value: any, options?: Partial<Object>): any

Function

Clone a primitive value, object literal or a Reka data type

tsx
const original = t.binaryExpression({
  left: t.literal({ value: 1 }),
  operator: '+',
  right: t.literal({ vlalue: 2 }),
});
const clone = t.clone(original);
console.log(original === clone); // false
// By default, the clone() util maintains the original ids
console.log(original.id === clone.id); // true
// Clone with new ids via the `replaceExistingIds` option:
const cloneWithNewIds = t.clone(original, {
  replaceExistingIds: true,
});
console.log(original.id === cloneWithNewIds.id); // false

toStringType(node: Expression): String

Function

isSameType(nodes: Array<Type>): boolean

Function

Given an array of Type instances, check if they are all the same Type