Migrate src folder to TypeScript

package.json

@@ -37,7 +37,9 @@
   "homepage": "https://github.com/cheminfo/spectra-processor#readme",
   "devDependencies": {
     "@babel/plugin-transform-modules-commonjs": "^7.27.1",
+    "@types/chroma-js": "^3.1.2",
     "@types/node": "^24.10.2",
+    "@types/object-hash": "^3.0.6",
     "@vitest/coverage-v8": "^4.0.15",
     "@zakodium/tsconfig": "^1.0.2",
     "cheminfo-build": "^1.3.1",

src/Kinds.ts

@@ -0,0 +1,84 @@
+import type { Entry } from 'jcampconverter';
+
+/**
+ * Display options for spectroscopy data
+ */
+export interface DisplayOptions {
+  xLabel: string;
+  xInverted: boolean;
+  yLabel: string;
+}
+
+/**
+ * Kind object defining how to handle a spectrum
+ */
+export interface Kind {
+  normalization?: Record<string, any>;
+  importation?: {
+    converter: (value: number) => number;
+  };
+  kind?: string;
+  display: DisplayOptions;
+}
+
+/**
+ * Determines the appropriate Kind based on JCAMP data
+ * @param data - JCAMP entry data
+ * @returns The appropriate Kind or undefined
+ */
+export function getJcampKind(data: Entry): Kind | undefined {
+  if (!data.dataType || !data.spectra?.[0]?.yUnits) {
+    return undefined;
+  }
+
+  const dataType = data.dataType.toLowerCase();
+  const yUnits = data.spectra[0].yUnits.toLowerCase();
+
+  if (dataType.match(/infrared/)) {
+    if (yUnits.match(/absorbance/)) {
+      return IR_ABSORBANCE;
+    } else {
+      return IR_TRANSMITTANCE;
+    }
+  }
+  return undefined;
+}
+
+export const IR_TRANSMITTANCE: Kind = {
+  normalization: {},
+  importation: {
+    converter: (transmittance: number) => -Math.log10(transmittance),
+  },
+  kind: 'Infrared',
+  display: {
+    xLabel: 'wavelength [cm-1]',
+    xInverted: true,
+    yLabel: 'Absorbance',
+  },
+};
+
+export const IR_ABSORBANCE: Kind = {
+  normalization: {},
+  kind: 'Infrared',
+  display: {
+    xLabel: 'wavelength [cm-1]',
+    xInverted: true,
+    yLabel: 'Absorbance',
+  },
+};
+
+export const nmr1H: Kind = {
+  display: {
+    xLabel: 'δ [ppm]',
+    xInverted: true,
+    yLabel: 'Intensity',
+  },
+};
+
+export const nmr13C: Kind = {
+  display: {
+    xLabel: 'δ [ppm]',
+    xInverted: true,
+    yLabel: 'Intensity',
+  },
+};