packages/typegen/src/generate/consts.ts
// Copyright 2017-2024 @polkadot/typegen authors & contributors
// SPDX-License-Identifier: Apache-2.0
import type { Metadata } from '@polkadot/types/metadata/Metadata';
import type { Definitions } from '@polkadot/types/types';
import type { HexString } from '@polkadot/util/types';
import type { ExtraTypes } from './types.js';
import Handlebars from 'handlebars';
import * as defaultDefs from '@polkadot/types/interfaces/definitions';
import lookupDefinitions from '@polkadot/types-augment/lookup/definitions';
import { stringCamelCase } from '@polkadot/util';
import { compareName, createImports, formatType, initMeta, readTemplate, setImports, writeFile } from '../util/index.js';
const generateForMetaTemplate = Handlebars.compile(readTemplate('consts'));
/** @internal */
function generateForMeta (meta: Metadata, dest: string, extraTypes: ExtraTypes, isStrict: boolean, customLookupDefinitions?: Definitions): void {
writeFile(dest, (): string => {
const allTypes = {
'@polkadot/types-augment': {
lookup: {
...lookupDefinitions,
...customLookupDefinitions
}
},
'@polkadot/types/interfaces': defaultDefs,
...extraTypes
};
const imports = createImports(allTypes);
const allDefs = Object.entries(allTypes).reduce((defs, [path, obj]) => {
return Object.entries(obj).reduce((defs, [key, value]) => ({ ...defs, [`${path}/${key}`]: value }), defs);
}, {});
const { lookup, pallets, registry } = meta.asLatest;
const modules = pallets
.filter(({ constants }) => constants.length > 0)
.map(({ constants, name }) => {
if (!isStrict) {
setImports(allDefs, imports, ['Codec']);
}
const items = constants
.map(({ docs, name, type }) => {
const typeDef = lookup.getTypeDef(type);
const returnType = typeDef.lookupName || formatType(registry, allDefs, typeDef, imports);
setImports(allDefs, imports, [returnType]);
return {
docs,
name: stringCamelCase(name),
type: returnType
};
})
.sort(compareName);
return {
items,
name: stringCamelCase(name)
};
})
.sort(compareName);
return generateForMetaTemplate({
headerType: 'chain',
imports,
isStrict,
modules,
types: [
...Object.keys(imports.localTypes).sort().map<{ file: string; types: string[] }>((packagePath) => ({
file: packagePath.replace('@polkadot/types-augment', '@polkadot/types'),
types: Object.keys(imports.localTypes[packagePath])
})),
{
file: '@polkadot/api-base/types',
types: ['ApiTypes', 'AugmentedConst']
}
]
});
});
}
// Call `generateForMeta()` with current static metadata
/** @internal */
export function generateDefaultConsts (dest: string, data: HexString, extraTypes: ExtraTypes = {}, isStrict = false, customLookupDefinitions?: Definitions): void {
const { metadata } = initMeta(data, extraTypes);
return generateForMeta(metadata, dest, extraTypes, isStrict, customLookupDefinitions);
}