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requireTypesAtTop.js
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requireTypesAtTop.js
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import _ from 'lodash';
const schema = [
{
enum: ['always', 'never'],
type: 'string',
},
];
const create = (context) => {
const always = (context.options[0] || 'always') === 'always';
if (always) {
const sourceCode = context.getSourceCode();
// nodes representing type and import declarations
const ignoredNodes = [
// import ...
(node) => {
return node.type === 'ImportDeclaration';
},
// export type Foo = ...
// export opaque type Foo = ...
// export type Foo from ...
// export opaque type Foo from ...
(node) => {
return node.type === 'ExportNamedDeclaration' && node.exportKind === 'type';
},
// type Foo = ...
(node) => {
return node.type === 'TypeAlias';
},
// opaque type Foo = ...
(node) => {
return node.type === 'OpaqueType';
},
];
const isIgnoredNode = (node) => {
for (const predicate of ignoredNodes) {
if (predicate(node)) {
return true;
}
}
return false;
};
let regularCodeStartRange;
for (const node of sourceCode.ast.body) {
if (!isIgnoredNode(node)) {
regularCodeStartRange = node.range;
break;
}
}
if (!_.isArray(regularCodeStartRange)) {
// a source with only ignored nodes
return {};
}
return {
'TypeAlias, OpaqueType' (node) {
if (node.range[0] > regularCodeStartRange[0]) {
context.report({
message: 'All type declaration must be at the top of the file, after any import declarations.',
node,
});
}
},
};
}
return {};
};
export default {
create,
schema,
};