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+import { SetArray, put, remove } from './set-array';
+import {
+  encode,
+  // encodeGeneratedRanges,
+  // encodeOriginalScopes
+} from '@jridgewell/sourcemap-codec';
+import { TraceMap, decodedMappings } from '@jridgewell/trace-mapping';
+
+import {
+  COLUMN,
+  SOURCES_INDEX,
+  SOURCE_LINE,
+  SOURCE_COLUMN,
+  NAMES_INDEX,
+} from './sourcemap-segment';
+
+import type { SourceMapInput } from '@jridgewell/trace-mapping';
+// import type { OriginalScope, GeneratedRange } from '@jridgewell/sourcemap-codec';
+import type { SourceMapSegment } from './sourcemap-segment';
+import type {
+  DecodedSourceMap,
+  EncodedSourceMap,
+  Pos,
+  Mapping,
+  // BindingExpressionRange,
+  // OriginalPos,
+  // OriginalScopeInfo,
+  // GeneratedRangeInfo,
+} from './types';
+
+export type { DecodedSourceMap, EncodedSourceMap, Mapping };
+
+export type Options = {
+  file?: string | null;
+  sourceRoot?: string | null;
+};
+
+const NO_NAME = -1;
+
+/**
+ * Provides the state to generate a sourcemap.
+ */
+export class GenMapping {
+  declare private _names: SetArray<string>;
+  declare private _sources: SetArray<string>;
+  declare private _sourcesContent: (string | null)[];
+  declare private _mappings: SourceMapSegment[][];
+  // private declare _originalScopes: OriginalScope[][];
+  // private declare _generatedRanges: GeneratedRange[];
+  declare private _ignoreList: SetArray<number>;
+  declare file: string | null | undefined;
+  declare sourceRoot: string | null | undefined;
+
+  constructor({ file, sourceRoot }: Options = {}) {
+    this._names = new SetArray();
+    this._sources = new SetArray();
+    this._sourcesContent = [];
+    this._mappings = [];
+    // this._originalScopes = [];
+    // this._generatedRanges = [];
+    this.file = file;
+    this.sourceRoot = sourceRoot;
+    this._ignoreList = new SetArray();
+  }
+}
+
+interface PublicMap {
+  _names: GenMapping['_names'];
+  _sources: GenMapping['_sources'];
+  _sourcesContent: GenMapping['_sourcesContent'];
+  _mappings: GenMapping['_mappings'];
+  // _originalScopes: GenMapping['_originalScopes'];
+  // _generatedRanges: GenMapping['_generatedRanges'];
+  _ignoreList: GenMapping['_ignoreList'];
+}
+
+/**
+ * Typescript doesn't allow friend access to private fields, so this just casts the map into a type
+ * with public access modifiers.
+ */
+function cast(map: unknown): PublicMap {
+  return map as any;
+}
+
+/**
+ * A low-level API to associate a generated position with an original source position. Line and
+ * column here are 0-based, unlike `addMapping`.
+ */
+export function addSegment(
+  map: GenMapping,
+  genLine: number,
+  genColumn: number,
+  source?: null,
+  sourceLine?: null,
+  sourceColumn?: null,
+  name?: null,
+  content?: null,
+): void;
+export function addSegment(
+  map: GenMapping,
+  genLine: number,
+  genColumn: number,
+  source: string,
+  sourceLine: number,
+  sourceColumn: number,
+  name?: null,
+  content?: string | null,
+): void;
+export function addSegment(
+  map: GenMapping,
+  genLine: number,
+  genColumn: number,
+  source: string,
+  sourceLine: number,
+  sourceColumn: number,
+  name: string,
+  content?: string | null,
+): void;
+export function addSegment(
+  map: GenMapping,
+  genLine: number,
+  genColumn: number,
+  source?: string | null,
+  sourceLine?: number | null,
+  sourceColumn?: number | null,
+  name?: string | null,
+  content?: string | null,
+): void {
+  return addSegmentInternal(
+    false,
+    map,
+    genLine,
+    genColumn,
+    source,
+    sourceLine,
+    sourceColumn,
+    name,
+    content,
+  );
+}
+
+/**
+ * A high-level API to associate a generated position with an original source position. Line is
+ * 1-based, but column is 0-based, due to legacy behavior in `source-map` library.
+ */
+export function addMapping(
+  map: GenMapping,
+  mapping: {
+    generated: Pos;
+    source?: null;
+    original?: null;
+    name?: null;
+    content?: null;
+  },
+): void;
+export function addMapping(
+  map: GenMapping,
+  mapping: {
+    generated: Pos;
+    source: string;
+    original: Pos;
+    name?: null;
+    content?: string | null;
+  },
+): void;
+export function addMapping(
+  map: GenMapping,
+  mapping: {
+    generated: Pos;
+    source: string;
+    original: Pos;
+    name: string;
+    content?: string | null;
+  },
+): void;
+export function addMapping(
+  map: GenMapping,
+  mapping: {
+    generated: Pos;
+    source?: string | null;
+    original?: Pos | null;
+    name?: string | null;
+    content?: string | null;
+  },
+): void {
+  return addMappingInternal(false, map, mapping as Parameters<typeof addMappingInternal>[2]);
+}
+
+/**
+ * Same as `addSegment`, but will only add the segment if it generates useful information in the
+ * resulting map. This only works correctly if segments are added **in order**, meaning you should
+ * not add a segment with a lower generated line/column than one that came before.
+ */
+export const maybeAddSegment: typeof addSegment = (
+  map,
+  genLine,
+  genColumn,
+  source,
+  sourceLine,
+  sourceColumn,
+  name,
+  content,
+) => {
+  return addSegmentInternal(
+    true,
+    map,
+    genLine,
+    genColumn,
+    source,
+    sourceLine,
+    sourceColumn,
+    name,
+    content,
+  );
+};
+
+/**
+ * Same as `addMapping`, but will only add the mapping if it generates useful information in the
+ * resulting map. This only works correctly if mappings are added **in order**, meaning you should
+ * not add a mapping with a lower generated line/column than one that came before.
+ */
+export const maybeAddMapping: typeof addMapping = (map, mapping) => {
+  return addMappingInternal(true, map, mapping as Parameters<typeof addMappingInternal>[2]);
+};
+
+/**
+ * Adds/removes the content of the source file to the source map.
+ */
+export function setSourceContent(map: GenMapping, source: string, content: string | null): void {
+  const {
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    // _originalScopes: originalScopes,
+  } = cast(map);
+  const index = put(sources, source);
+  sourcesContent[index] = content;
+  // if (index === originalScopes.length) originalScopes[index] = [];
+}
+
+export function setIgnore(map: GenMapping, source: string, ignore = true) {
+  const {
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    _ignoreList: ignoreList,
+    // _originalScopes: originalScopes,
+  } = cast(map);
+  const index = put(sources, source);
+  if (index === sourcesContent.length) sourcesContent[index] = null;
+  // if (index === originalScopes.length) originalScopes[index] = [];
+  if (ignore) put(ignoreList, index);
+  else remove(ignoreList, index);
+}
+
+/**
+ * Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
+ * a sourcemap, or to JSON.stringify.
+ */
+export function toDecodedMap(map: GenMapping): DecodedSourceMap {
+  const {
+    _mappings: mappings,
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    _names: names,
+    _ignoreList: ignoreList,
+    // _originalScopes: originalScopes,
+    // _generatedRanges: generatedRanges,
+  } = cast(map);
+  removeEmptyFinalLines(mappings);
+
+  return {
+    version: 3,
+    file: map.file || undefined,
+    names: names.array,
+    sourceRoot: map.sourceRoot || undefined,
+    sources: sources.array,
+    sourcesContent,
+    mappings,
+    // originalScopes,
+    // generatedRanges,
+    ignoreList: ignoreList.array,
+  };
+}
+
+/**
+ * Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
+ * a sourcemap, or to JSON.stringify.
+ */
+export function toEncodedMap(map: GenMapping): EncodedSourceMap {
+  const decoded = toDecodedMap(map);
+  return Object.assign({}, decoded, {
+    // originalScopes: decoded.originalScopes.map((os) => encodeOriginalScopes(os)),
+    // generatedRanges: encodeGeneratedRanges(decoded.generatedRanges as GeneratedRange[]),
+    mappings: encode(decoded.mappings as SourceMapSegment[][]),
+  });
+}
+
+/**
+ * Constructs a new GenMapping, using the already present mappings of the input.
+ */
+export function fromMap(input: SourceMapInput): GenMapping {
+  const map = new TraceMap(input);
+  const gen = new GenMapping({ file: map.file, sourceRoot: map.sourceRoot });
+
+  putAll(cast(gen)._names, map.names);
+  putAll(cast(gen)._sources, map.sources as string[]);
+  cast(gen)._sourcesContent = map.sourcesContent || map.sources.map(() => null);
+  cast(gen)._mappings = decodedMappings(map) as GenMapping['_mappings'];
+  // TODO: implement originalScopes/generatedRanges
+  if (map.ignoreList) putAll(cast(gen)._ignoreList, map.ignoreList);
+
+  return gen;
+}
+
+/**
+ * Returns an array of high-level mapping objects for every recorded segment, which could then be
+ * passed to the `source-map` library.
+ */
+export function allMappings(map: GenMapping): Mapping[] {
+  const out: Mapping[] = [];
+  const { _mappings: mappings, _sources: sources, _names: names } = cast(map);
+
+  for (let i = 0; i < mappings.length; i++) {
+    const line = mappings[i];
+    for (let j = 0; j < line.length; j++) {
+      const seg = line[j];
+
+      const generated = { line: i + 1, column: seg[COLUMN] };
+      let source: string | undefined = undefined;
+      let original: Pos | undefined = undefined;
+      let name: string | undefined = undefined;
+
+      if (seg.length !== 1) {
+        source = sources.array[seg[SOURCES_INDEX]];
+        original = { line: seg[SOURCE_LINE] + 1, column: seg[SOURCE_COLUMN] };
+
+        if (seg.length === 5) name = names.array[seg[NAMES_INDEX]];
+      }
+
+      out.push({ generated, source, original, name } as Mapping);
+    }
+  }
+
+  return out;
+}
+
+// This split declaration is only so that terser can elminiate the static initialization block.
+function addSegmentInternal<S extends string | null | undefined>(
+  skipable: boolean,
+  map: GenMapping,
+  genLine: number,
+  genColumn: number,
+  source: S,
+  sourceLine: S extends string ? number : null | undefined,
+  sourceColumn: S extends string ? number : null | undefined,
+  name: S extends string ? string | null | undefined : null | undefined,
+  content: S extends string ? string | null | undefined : null | undefined,
+): void {
+  const {
+    _mappings: mappings,
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    _names: names,
+    // _originalScopes: originalScopes,
+  } = cast(map);
+  const line = getIndex(mappings, genLine);
+  const index = getColumnIndex(line, genColumn);
+
+  if (!source) {
+    if (skipable && skipSourceless(line, index)) return;
+    return insert(line, index, [genColumn]);
+  }
+
+  // Sigh, TypeScript can't figure out sourceLine and sourceColumn aren't nullish if source
+  // isn't nullish.
+  assert<number>(sourceLine);
+  assert<number>(sourceColumn);
+
+  const sourcesIndex = put(sources, source);
+  const namesIndex = name ? put(names, name) : NO_NAME;
+  if (sourcesIndex === sourcesContent.length) sourcesContent[sourcesIndex] = content ?? null;
+  // if (sourcesIndex === originalScopes.length) originalScopes[sourcesIndex] = [];
+
+  if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
+    return;
+  }
+
+  return insert(
+    line,
+    index,
+    name
+      ? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
+      : [genColumn, sourcesIndex, sourceLine, sourceColumn],
+  );
+}
+
+function assert<T>(_val: unknown): asserts _val is T {
+  // noop.
+}
+
+function getIndex<T>(arr: T[][], index: number): T[] {
+  for (let i = arr.length; i <= index; i++) {
+    arr[i] = [];
+  }
+  return arr[index];
+}
+
+function getColumnIndex(line: SourceMapSegment[], genColumn: number): number {
+  let index = line.length;
+  for (let i = index - 1; i >= 0; index = i--) {
+    const current = line[i];
+    if (genColumn >= current[COLUMN]) break;
+  }
+  return index;
+}
+
+function insert<T>(array: T[], index: number, value: T) {
+  for (let i = array.length; i > index; i--) {
+    array[i] = array[i - 1];
+  }
+  array[index] = value;
+}
+
+function removeEmptyFinalLines(mappings: SourceMapSegment[][]) {
+  const { length } = mappings;
+  let len = length;
+  for (let i = len - 1; i >= 0; len = i, i--) {
+    if (mappings[i].length > 0) break;
+  }
+  if (len < length) mappings.length = len;
+}
+
+function putAll<T extends string | number>(setarr: SetArray<T>, array: T[]) {
+  for (let i = 0; i < array.length; i++) put(setarr, array[i]);
+}
+
+function skipSourceless(line: SourceMapSegment[], index: number): boolean {
+  // The start of a line is already sourceless, so adding a sourceless segment to the beginning
+  // doesn't generate any useful information.
+  if (index === 0) return true;
+
+  const prev = line[index - 1];
+  // If the previous segment is also sourceless, then adding another sourceless segment doesn't
+  // genrate any new information. Else, this segment will end the source/named segment and point to
+  // a sourceless position, which is useful.
+  return prev.length === 1;
+}
+
+function skipSource(
+  line: SourceMapSegment[],
+  index: number,
+  sourcesIndex: number,
+  sourceLine: number,
+  sourceColumn: number,
+  namesIndex: number,
+): boolean {
+  // A source/named segment at the start of a line gives position at that genColumn
+  if (index === 0) return false;
+
+  const prev = line[index - 1];
+
+  // If the previous segment is sourceless, then we're transitioning to a source.
+  if (prev.length === 1) return false;
+
+  // If the previous segment maps to the exact same source position, then this segment doesn't
+  // provide any new position information.
+  return (
+    sourcesIndex === prev[SOURCES_INDEX] &&
+    sourceLine === prev[SOURCE_LINE] &&
+    sourceColumn === prev[SOURCE_COLUMN] &&
+    namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME)
+  );
+}
+
+function addMappingInternal<S extends string | null | undefined>(
+  skipable: boolean,
+  map: GenMapping,
+  mapping: {
+    generated: Pos;
+    source: S;
+    original: S extends string ? Pos : null | undefined;
+    name: S extends string ? string | null | undefined : null | undefined;
+    content: S extends string ? string | null | undefined : null | undefined;
+  },
+) {
+  const { generated, source, original, name, content } = mapping;
+  if (!source) {
+    return addSegmentInternal(
+      skipable,
+      map,
+      generated.line - 1,
+      generated.column,
+      null,
+      null,
+      null,
+      null,
+      null,
+    );
+  }
+  assert<Pos>(original);
+  return addSegmentInternal(
+    skipable,
+    map,
+    generated.line - 1,
+    generated.column,
+    source as string,
+    original.line - 1,
+    original.column,
+    name,
+    content,
+  );
+}
+
+/*
+export function addOriginalScope(
+  map: GenMapping,
+  data: {
+    start: Pos;
+    end: Pos;
+    source: string;
+    kind: string;
+    name?: string;
+    variables?: string[];
+  },
+): OriginalScopeInfo {
+  const { start, end, source, kind, name, variables } = data;
+  const {
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    _originalScopes: originalScopes,
+    _names: names,
+  } = cast(map);
+  const index = put(sources, source);
+  if (index === sourcesContent.length) sourcesContent[index] = null;
+  if (index === originalScopes.length) originalScopes[index] = [];
+
+  const kindIndex = put(names, kind);
+  const scope: OriginalScope = name
+    ? [start.line - 1, start.column, end.line - 1, end.column, kindIndex, put(names, name)]
+    : [start.line - 1, start.column, end.line - 1, end.column, kindIndex];
+  if (variables) {
+    scope.vars = variables.map((v) => put(names, v));
+  }
+  const len = originalScopes[index].push(scope);
+  return [index, len - 1, variables];
+}
+*/
+
+// Generated Ranges
+/*
+export function addGeneratedRange(
+  map: GenMapping,
+  data: {
+    start: Pos;
+    isScope: boolean;
+    originalScope?: OriginalScopeInfo;
+    callsite?: OriginalPos;
+  },
+): GeneratedRangeInfo {
+  const { start, isScope, originalScope, callsite } = data;
+  const {
+    _originalScopes: originalScopes,
+    _sources: sources,
+    _sourcesContent: sourcesContent,
+    _generatedRanges: generatedRanges,
+  } = cast(map);
+
+  const range: GeneratedRange = [
+    start.line - 1,
+    start.column,
+    0,
+    0,
+    originalScope ? originalScope[0] : -1,
+    originalScope ? originalScope[1] : -1,
+  ];
+  if (originalScope?.[2]) {
+    range.bindings = originalScope[2].map(() => [[-1]]);
+  }
+  if (callsite) {
+    const index = put(sources, callsite.source);
+    if (index === sourcesContent.length) sourcesContent[index] = null;
+    if (index === originalScopes.length) originalScopes[index] = [];
+    range.callsite = [index, callsite.line - 1, callsite.column];
+  }
+  if (isScope) range.isScope = true;
+  generatedRanges.push(range);
+
+  return [range, originalScope?.[2]];
+}
+
+export function setEndPosition(range: GeneratedRangeInfo, pos: Pos) {
+  range[0][2] = pos.line - 1;
+  range[0][3] = pos.column;
+}
+
+export function addBinding(
+  map: GenMapping,
+  range: GeneratedRangeInfo,
+  variable: string,
+  expression: string | BindingExpressionRange,
+) {
+  const { _names: names } = cast(map);
+  const bindings = (range[0].bindings ||= []);
+  const vars = range[1];
+
+  const index = vars!.indexOf(variable);
+  const binding = getIndex(bindings, index);
+
+  if (typeof expression === 'string') binding[0] = [put(names, expression)];
+  else {
+    const { start } = expression;
+    binding.push([put(names, expression.expression), start.line - 1, start.column]);
+  }
+}
+*/