diff --git a/spec/tsconfig.spec.json b/spec/tsconfig.spec.json
index 715af20a687265836a0d9fd23b17a82202e0292a..e4dd293248da9879ea2970dd62d2ace4a9c75a51 100644
--- a/spec/tsconfig.spec.json
+++ b/spec/tsconfig.spec.json
@@ -1,11 +1,11 @@
 {
   "extends": "../tsconfig.json",
   "compilerOptions": {
-    "outDir": "../build",
-    "types": [
-    //   "jasmine",
-      "node" // pour pouvoir utiliser node dans le code
- ]
+    "outDir": "../build"
+//    "types": [
+//    //   "jasmine",
+//      "node" // les paquets listés dans types LIMITENT les includes à ces paquets
+// ]
   },
   // "files": [
   //   "test.ts"
diff --git a/src/index.ts b/src/index.ts
index 36acf01cb7ca0d9ea986cc65e20ae3e71f022b7a..c3881b8c41acf781e6673e4c4b89fa52e9fb80ca 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -8,4 +8,4 @@ export * from './regime_uniforme';
 export * from './util/definedvalue';
 export * from './util/numericalstring';
 export * from './util/error';
-export * from './internationalisation';
+
diff --git a/src/internationalisation.ts b/src/internationalisation.ts
deleted file mode 100644
index cb8f93320d4776fac2f36ad39cfb4059858b7198..0000000000000000000000000000000000000000
--- a/src/internationalisation.ts
+++ /dev/null
@@ -1,344 +0,0 @@
-import { Result } from "./base";
-import { ErrorMessage, ErrorCode } from "./util/error";
-
-import * as fs from 'fs';
-
-export enum Language {
-    FRENCH,
-
-    ENGLISH,
-}
-
-export class Internationalisation {
-    private _lang: Language;
-    private _sLang: string;
-    private static _instance: Internationalisation;
-    private _errorMessages: { [key: string]: string };
-
-    private constructor() { }
-
-    public static getInstance(): Internationalisation {
-        if (this._instance == undefined)
-            this._instance = new Internationalisation();
-        return this._instance;
-    }
-
-    public get lang() {
-        return this._lang;
-    }
-
-    public set lang(l: Language) {
-        this._lang = l;
-        this._sLang = Language[l];
-    }
-
-    public setLocale(loc: string) {
-        let l: string = loc.substr(0, 2).toLowerCase();
-        if (l === "en")
-            this.lang = Language.ENGLISH;
-        else if (l === "fr")
-            this.lang = Language.FRENCH;
-        else {
-            let e = new ErrorMessage(ErrorCode.ERROR_LANG_UNSUPPORTED);
-            e.extraVar["locale"] = loc;
-            throw e;
-        }
-
-        this.loadErrorMessages();
-    }
-
-    private loadErrorMessages() {
-        let l;
-        switch (this.lang) {
-            case Language.FRENCH:
-                l = "fr";
-                break;
-
-            default:
-                l = "en";
-        }
-
-        let s: string = fs.readFileSync("src/error_messages." + l + ".json", "utf8");
-        this._errorMessages = JSON.parse(s);
-    }
-
-    private getErrorMessageFromCode(c: ErrorCode): string {
-        let sCode: string = ErrorCode[c];
-        return this._errorMessages[ErrorCode[c]];
-    }
-
-    private replaceAll(str: string, find: string, replace: string) {
-        return str.replace(new RegExp(find, 'g'), replace);
-    }
-
-    public localizeErrorMessage(r: ErrorMessage): string {
-        let sCode: string = ErrorCode[r.code];
-        let m: string = this.getErrorMessageFromCode(r.code);
-
-        for (let k in r.extraVar) {
-            m = this.replaceAll(m, "%" + k + "%", r.extraVar[k]);
-        }
-
-        return m;
-    }
-
-    /*
-    public localizeErrorMessage(r: ErrorMessage): string {
-        let m: string;
-        let sCode: string = ErrorCode[r.code];
-
-        switch (this.lang) {
-            case Language.ENGLISH:
-                switch (r.code) {
-                    case ErrorCode.ERROR_DICHO_INIT_DOMAIN:
-                        m = "Dichotomy : target " + r.extraVar["targetSymbol"];
-                        m += "=" + r.extraVar["targetValue"];
-                        m += " does not exist for variable " + r.extraVar["variableSymbol"];
-                        m += " valued in interval " + r.extraVar["variableInterval"];
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_INITVALUE_HIGH:
-                    case ErrorCode.ERROR_DICHO_INITVALUE_LOW:
-                        m = "Dichotomy : initial value " + r.extraVar["variableSymbol"];
-                        m += "=" + r.extraVar["variableInitValue"];
-                        if (r.code == ErrorCode.ERROR_DICHO_INITVALUE_HIGH)
-                            m += " is too high";
-                        else if (r.code == ErrorCode.ERROR_DICHO_INITVALUE_LOW)
-                            m += " is too low";
-
-                        m += " (target is " + r.extraVar["targetSymbol"];
-                        m += "=" + r.extraVar["targetValue"];
-                        m += ", " + r.extraVar["targetSymbol"];
-                        m += "(" + r.extraVar["variableSymbol"];
-                        m += "=" + r.extraVar["variableInitValue"]
-                        m += ")=" + r.extraVar["initTarget"] + ")";
-                        break;
-
-
-                    case ErrorCode.ERROR_DICHO_NULL_STEP:
-                        m = "Dichotomy (initial interval search) : invalid null step";
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_INVALID_STEP_GROWTH:
-                        m = "Dichotomy (initial interval search) : invalid null step growth";
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_FUNCTION_VARIATION:
-                        m = "unable to determinate function direction of variation";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDOMAIN_INTERVAL_BOUNDS:
-                        m = "invalid ";
-                        m += String(r.extraVar["minValue"]);
-                        m += "/";
-                        m += String(r.extraVar["maxValue"]);
-                        m += " min/max boundaries for 'interval' parameter definition domain";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_CALC_UNDEFINED:
-                        m = "calculability of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter is undefined";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_UNDEFINED:
-                        m = "value of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter is undefined";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_FIXED:
-                        m = "value of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter cannot be changed";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_POS:
-                        m = "value ";
-                        m += String(r.extraVar["value"]);
-                        m += " of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter is invalid ";
-                        m += " (cannot be <=0)";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_POSNULL:
-                        m = "value ";
-                        m += String(r.extraVar["value"]);
-                        m += " of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter is invalid ";
-                        m += " (cannot be <0)";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_NULL:
-                        m = "value of '";
-                        m += r.extraVar["symbol"];
-                        m += "' parameter cannot be 0";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_INTERVAL:
-                        m = "parameter '";
-                        m += r.extraVar["symbol"];
-                        m += "' : value ";
-                        m += r.extraVar["value"];
-                        m += " is out of [";
-                        m += r.extraVar["minValue"];
-                        m += ", ";
-                        m += r.extraVar["maxValue"];
-                        m += "] interval";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDOMAIN_INVALID:
-                        m = "parameter '";
-                        m += r.extraVar["symbol"];
-                        m += "' : non supported '";
-                        m += r.extraVar["domain"];
-                        m += "' definition domain";
-                        break;
-
-                    case ErrorCode.ERROR_INTERVAL_UNDEF:
-                        m = "Interval : invalid 'undefined' value";
-                        break;
-
-                    case ErrorCode.ERROR_INTERVAL_OUTSIDE:
-                        m = "Interval : value ";
-                        m += r.extraVar["value"];
-                        m += " is outside of ";
-                        m += r.extraVar["interval"];
-                        break;
-
-                    default:
-                        throw "unprocessed ResultCode value " + sCode + " for language " + this._sLang;
-                }
-                break;
-
-            case Language.FRENCH:
-                switch (r.code) {
-                    case ErrorCode.ERROR_DICHO_INIT_DOMAIN:
-                        m = "Dichotomie : la valeur cible " + r.extraVar["targetSymbol"];
-                        m += "=" + r.extraVar["targetValue"];
-                        m += " n'existe pas pour la variable " + r.extraVar["variableSymbol"] + " prise dans l'intervalle " + r.extraVar["variableInterval"];
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_INITVALUE_HIGH:
-                    case ErrorCode.ERROR_DICHO_INITVALUE_LOW:
-                        m = "Dichotomie : la valeur initiale " + r.extraVar["variableSymbol"];
-                        m += "=" + r.extraVar["variableInitValue"];
-                        if (r.code == ErrorCode.ERROR_DICHO_INITVALUE_HIGH)
-                            m += " est trop grande";
-                        else if (r.code == ErrorCode.ERROR_DICHO_INITVALUE_LOW)
-                            m += " est trop petite";
-
-                        m += " (la valeur cible est " + r.extraVar["targetSymbol"];
-                        m += "=" + r.extraVar["targetValue"];
-                        m += ", " + r.extraVar["targetSymbol"];
-                        m += "(" + r.extraVar["variableSymbol"];
-                        m += "=" + r.extraVar["variableInitValue"]
-                        m += ")=" + r.extraVar["initTarget"] + ")";
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_NULL_STEP:
-                        m = "Dichotomie : le pas pour la recherche de l'intervalle de départ ne devrait pas être nul";
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_INVALID_STEP_GROWTH:
-                        m = "Dichotomie : l'augmentation du pas pour la recherche de l'intervalle de départ est incorrecte (=0)";
-                        break;
-
-                    case ErrorCode.ERROR_DICHO_FUNCTION_VARIATION:
-                        m = "Dichotomie : impossible de determiner le sens de  variation de la fonction";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDOMAIN_INTERVAL_BOUNDS:
-                        m = "Les bornes (";
-                        m += String(r.extraVar["minValue"]);
-                        m += "/";
-                        m += String(r.extraVar["maxValue"]);
-                        m += ") de l'intervalle sont incorrectes";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_CALC_UNDEFINED:
-                        m = "La calculabilité du paramètre ";
-                        m += r.extraVar["symbol"];
-                        m += " n'est pas définie";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_UNDEFINED:
-                        m = "La valeur du paramètre ";
-                        m += r.extraVar["symbol"];
-                        m += " n'est pas définie";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_FIXED:
-                        m = "La valeur du paramètre ";
-                        m += r.extraVar["symbol"];
-                        m += " ne peut pas être changée";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_POS:
-                        m = "La valeur ";
-                        m += String(r.extraVar["value"]);
-                        m += " du paramètre '";
-                        m += r.extraVar["symbol"];
-                        m += "' est incorrecte (<=0)";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_POSNULL:
-                        m = "La valeur ";
-                        m += String(r.extraVar["value"]);
-                        m += " du paramètre '";
-                        m += r.extraVar["symbol"];
-                        m += "' est incorrecte (<0)";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_NULL:
-                        m = "La valeur du paramètre '";
-                        m += r.extraVar["symbol"];
-                        m += "' ne peut pas être nulle";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDEF_VALUE_INTERVAL:
-                        m = "Paramètre '";
-                        m += r.extraVar["symbol"];
-                        m += "' : la valeur ";
-                        m += r.extraVar["value"];
-                        m += " est en dehors de l'intervalle [";
-                        m += r.extraVar["minValue"];
-                        m += ", ";
-                        m += r.extraVar["maxValue"];
-                        m += "]";
-                        break;
-
-                    case ErrorCode.ERROR_PARAMDOMAIN_INVALID:
-                        m = "Paramètre '";
-                        m += r.extraVar["symbol"];
-                        m += "' : le domaine de définition '";
-                        m += r.extraVar["domain"];
-                        m += "' est incorrect";
-                        break;
-
-                    case ErrorCode.ERROR_INTERVAL_UNDEF:
-                        m = "Interval : valeur 'undefined' incorrecte";
-                        break;
-
-                    case ErrorCode.ERROR_INTERVAL_OUTSIDE:
-                        m = "Interval : la valeur ";
-                        m += r.extraVar["value"];
-                        m += " est hors de l'intervalle ";
-                        m += r.extraVar["interval"];
-                        break;
-
-                    default:
-                        throw "unprocessed ResultCode value " + sCode + " for language " + this._sLang;
-                }
-                break;
-
-            default:
-                throw "unprocessed Language value " + this._sLang;
-        }
-
-        return m;
-    }
-    */
-}
diff --git a/src/tsconfig.app.json b/src/tsconfig.app.json
index 8d4696423d9944cb99c348fb094a5b7d5bbadec1..c1d5fa6f4a5e28a1db9722c74082f6eceb8915dc 100644
--- a/src/tsconfig.app.json
+++ b/src/tsconfig.app.json
@@ -1,9 +1,9 @@
 {
   "extends": "../tsconfig.json",
   "compilerOptions": {
-    "types": [
-      "node" // pour pouvoir utiliser node dans le code
-    ],
+//    "types": [
+//      "node" // les paquets listés dans types LIMITENT les includes à ces paquets
+//    ],
     "removeComments": false,
     "declaration": true // génère le fichier .d.ts à partir de index.ts
   },