/** Canonical readonly spelling. Each edit preserves the current layer's contract. */
import type { TypeDeclaration, TypeSyntax } from "../../ast.ts";
import type { DiagnosticFix } from "../../diagnostic.ts";
import type { Span } from "../../source.ts";
import { type ValueType } from "../../types.ts";
export interface ReadonlyAdvisoryHost {
    readonly sourceText: string;
    advise(code: string, message: string, span: Span, fix?: DiagnosticFix): void;
    fieldsOf(identity: string): ReadonlyMap<string, ValueType> | null;
    readonlyFieldsOf(identity: string): ReadonlySet<string> | null;
}
export declare function adviseReadonlyDeclaration(host: ReadonlyAdvisoryHost, declaration: TypeDeclaration): void;
export declare function adviseReadonlyView(host: ReadonlyAdvisoryHost, syntax: Extract<TypeSyntax, {
    kind: "ReadonlyTypeSyntax";
}>, inner: ValueType): void;
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